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Date: Thu, 11 Jan 2018 09:14:10 -0800
From: Eric Dumazet <eric.dumazet@...il.com>
To: Ricardo Nabinger Sanchez <rnsanchez@...il.com>,
netdev@...r.kernel.org
Subject: Re: BUG: using smp_processor_id() in preemptible
On Thu, 2018-01-11 at 10:31 -0200, Ricardo Nabinger Sanchez wrote:
> Greetings,
>
> I'm getting occasional video lock-ups, and while checking logs I found
> these:
>
> ===
> [ 297.445296] BUG: using smp_processor_id() in preemptible [00000000] code: claws-mail/1635
> [ 297.445319] caller is jprobe_return+0x12/0x25
> [ 297.445332] CPU: 1 PID: 1635 Comm: claws-mail Not tainted 4.14.0 #1
> [ 297.445341] Hardware name: Micro-Star International Co., Ltd. GX780/GT780/MS-1761, BIOS E1761IMS V3.01 05/02/2011
> [ 297.445349] Call Trace:
> [ 297.445372] dump_stack+0x9f/0xe1
> [ 297.445392] check_preemption_disabled+0xec/0xf0
> [ 297.445409] jprobe_return+0x12/0x25
> [ 297.445425] tcp_v4_do_rcv+0x7f/0x1a0
> [ 297.445443] __release_sock+0x6d/0x100
> [ 297.445462] release_sock+0x2b/0xb0
> [ 297.445475] tcp_recvmsg+0x300/0x8f0
> [ 297.445504] ? __lock_acquire+0x3ee/0x1610
> [ 297.445517] ? core_sys_select+0x240/0x3e0
> [ 297.445541] inet_recvmsg+0x51/0x1b0
> [ 297.445566] sock_read_iter+0x8c/0xd0
> [ 297.445598] __vfs_read+0xd5/0x140
> [ 297.445632] vfs_read+0x9e/0x150
> [ 297.445652] SyS_read+0x45/0xa0
> [ 297.445675] entry_SYSCALL_64_fastpath+0x23/0xc2
> [ 297.445687] RIP: 0033:0x7ff2536001b8
> [ 297.445696] RSP: 002b:00007ff247152890 EFLAGS: 00000246 ORIG_RAX: 0000000000000000
> [ 297.445713] RAX: ffffffffffffffda RBX: ffff9cd088ccbff0 RCX: 00007ff2536001b8
> [ 297.445721] RDX: 0000000000000005 RSI: 00007ff23c02bb43 RDI: 0000000000000013
> [ 297.445730] RBP: 00007ff23c02bb43 R08: 0000000000000000 R09: 00007ff23c00e520
> [ 297.445738] R10: 0000000000100000 R11: 0000000000000246 R12: 0000000000000086
> [ 297.445746] R13: 000000000000002f R14: 00007ff254d3c998 R15: 0000000000000001
> ...
> [ 366.965766] BUG: using smp_processor_id() in preemptible [00000000] code: Socket Thread/1435
> [ 366.965769] caller is jprobe_return+0x12/0x25
> [ 366.965773] CPU: 0 PID: 1435 Comm: Socket Thread Not tainted 4.14.0 #1
> [ 366.965775] Hardware name: Micro-Star International Co., Ltd. GX780/GT780/MS-1761, BIOS E1761IMS V3.01 05/02/2011
> [ 366.965777] Call Trace:
> [ 366.965780] dump_stack+0x9f/0xe1
> [ 366.965786] check_preemption_disabled+0xec/0xf0
> [ 366.965790] jprobe_return+0x12/0x25
> [ 366.965793] tcp_v4_do_rcv+0x7f/0x1a0
> [ 366.965797] __release_sock+0x6d/0x100
> [ 366.965811] release_sock+0x2b/0xb0
> [ 366.965813] tcp_recvmsg+0x300/0x8f0
> [ 366.965826] inet_recvmsg+0x51/0x1b0
> [ 366.965834] SYSC_recvfrom+0xc6/0x130
> [ 366.965845] ? entry_SYSCALL_64_fastpath+0x5/0xc2
> [ 366.965848] ? trace_hardirqs_on_caller+0xcb/0x200
> [ 366.965851] ? trace_hardirqs_on_thunk+0x1a/0x1c
> [ 366.965858] entry_SYSCALL_64_fastpath+0x23/0xc2
> [ 366.965860] RIP: 0033:0x7f475ab7e5da
> [ 366.965862] RSP: 002b:00007f47438fc8b0 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
> [ 366.965864] RAX: ffffffffffffffda RBX: ffff9cd088ae7ff0 RCX: 00007f475ab7e5da
> [ 366.965865] RDX: 0000000000008000 RSI: 00007f4721202000 RDI: 000000000000007c
> [ 366.965867] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> [ 366.965868] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000086
> [ 366.965869] R13: 00007f47212025a8 R14: 0000000000007a58 R15: 00007f474ba1e5f2
> [ 366.966571] BUG: using smp_processor_id() in preemptible [00000000] code: Socket Thread/1435
> [ 366.966574] caller is jprobe_return+0x12/0x25
> [ 366.966576] CPU: 0 PID: 1435 Comm: Socket Thread Not tainted 4.14.0 #1
> [ 366.966577] Hardware name: Micro-Star International Co., Ltd. GX780/GT780/MS-1761, BIOS E1761IMS V3.01 05/02/2011
> [ 366.966578] Call Trace:
> [ 366.966582] dump_stack+0x9f/0xe1
> [ 366.966586] check_preemption_disabled+0xec/0xf0
> [ 366.966592] jprobe_return+0x12/0x25
> [ 366.966596] tcp_v4_do_rcv+0x7f/0x1a0
> [ 366.966601] __release_sock+0x6d/0x100
> [ 366.966606] release_sock+0x2b/0xb0
> [ 366.966610] tcp_recvmsg+0x300/0x8f0
> [ 366.966622] inet_recvmsg+0x51/0x1b0
> [ 366.966630] SYSC_recvfrom+0xc6/0x130
> [ 366.966643] ? entry_SYSCALL_64_fastpath+0x5/0xc2
> [ 366.966647] ? trace_hardirqs_on_caller+0xcb/0x200
> [ 366.966651] ? trace_hardirqs_on_thunk+0x1a/0x1c
> [ 366.966667] entry_SYSCALL_64_fastpath+0x23/0xc2
> [ 366.966669] RIP: 0033:0x7f475ab7e5da
> [ 366.966670] RSP: 002b:00007f47438fc8b0 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
> [ 366.966673] RAX: ffffffffffffffda RBX: ffff9cd088ae7ff0 RCX: 00007f475ab7e5da
> [ 366.966674] RDX: 0000000000008000 RSI: 00007f4721202000 RDI: 000000000000007c
> [ 366.966676] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> [ 366.966677] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000086
> [ 366.966679] R13: 00007f47438fca70 R14: 00000000000005a8 R15: 00007f4721202000
> [ 366.979991] BUG: using smp_processor_id() in preemptible [00000000] code: Socket Thread/1435
> [ 366.979999] caller is jprobe_return+0x12/0x25
> [ 366.980004] CPU: 0 PID: 1435 Comm: Socket Thread Not tainted 4.14.0 #1
> [ 366.980007] Hardware name: Micro-Star International Co., Ltd. GX780/GT780/MS-1761, BIOS E1761IMS V3.01 05/02/2011
> [ 366.980012] Call Trace:
> [ 366.980023] dump_stack+0x9f/0xe1
> [ 366.980033] check_preemption_disabled+0xec/0xf0
> [ 366.980040] jprobe_return+0x12/0x25
> [ 366.980046] tcp_v4_do_rcv+0x7f/0x1a0
> [ 366.980054] __release_sock+0x6d/0x100
> [ 366.980062] release_sock+0x2b/0xb0
> [ 366.980068] tcp_recvmsg+0x300/0x8f0
> [ 366.980105] inet_recvmsg+0x51/0x1b0
> [ 366.980117] SYSC_recvfrom+0xc6/0x130
> [ 366.980130] ? entry_SYSCALL_64_fastpath+0x5/0xc2
> [ 366.980134] ? trace_hardirqs_on_caller+0xcb/0x200
> [ 366.980137] ? trace_hardirqs_on_thunk+0x1a/0x1c
> [ 366.980145] entry_SYSCALL_64_fastpath+0x23/0xc2
> [ 366.980147] RIP: 0033:0x7f475ab7e5da
> [ 366.980149] RSP: 002b:00007f47438fc8b0 EFLAGS: 00000246 ORIG_RAX: 000000000000002d
> [ 366.980152] RAX: ffffffffffffffda RBX: ffff9cd088ae7ff0 RCX: 00007f475ab7e5da
> [ 366.980154] RDX: 0000000000008000 RSI: 00007f4721202000 RDI: 000000000000007c
> [ 366.980157] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
> [ 366.980158] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000086
> [ 366.980161] R13: 0000000000008000 R14: 00007f47438fca70 R15: 00007f474ba1e5f2
> ===
>
> There are many of those, and they keep popping up throughout normal
> usage. Sometimes, though, things go awry but without much information:
>
> ===
> Jan 10 17:54:39 kernel: [ 2717.421681] note: Socket Thread[1812] exited with preempt_count 1
> ===
>
> It seems that when the event above happens (preempt_count 1), a chain of
> events unfolds and my video locks up. Sometimes the mouse pointer will
> continue to work; others it is a full lockup.
>
> I understand this is not necessarily linked to the network stack, but as it
> happens, the traces always have the network stack in common and the application
> that exits has always been one that deals with network (Firefox and Claws
> Mail so far).
>
> This has been happening for quite a while now, at least since 4.9 (probably
> before that). I don't know how to trigger this: it could take as much as
> 45 days to "lock up" or as little as a few minutes in sequence. Yesterday,
> the first time it locked up took around 20 days, and then less than 10 minutes.
>
>
> The best information I have are dumps from SysRq:
> ===
> Jan 10 17:54:39 darkbook kernel: [ 2717.421681] note: Socket Thread[1812] exited with preempt_count 1
> Jan 10 17:55:45 darkbook acpid: client 1084[0:100] has disconnected
> Jan 10 17:55:46 darkbook /usr/sbin/gpm[970]: *** info [mice.c(1990)]:
> Jan 10 17:55:46 darkbook /usr/sbin/gpm[970]: imps2: Auto-detected intellimouse PS/2
> Jan 10 17:56:12 darkbook kernel: [ 2811.376514] sysrq: SysRq : Show Locks Held
> Jan 10 17:56:14 darkbook kernel: [ 2813.214132] sysrq: SysRq : Show backtrace of all active CPUs
> Jan 10 17:56:14 darkbook kernel: [ 2813.215131] Sending NMI from CPU 0 to CPUs 1-7:
> Jan 10 17:56:16 darkbook kernel: [ 2814.975638] sysrq: SysRq : Show Blocked State
> Jan 10 17:56:16 darkbook kernel: [ 2814.975679] task PC stack pid father
> Jan 10 17:56:20 darkbook kernel: [ 2819.060962] localStorage DB S 0 1884 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.061483] LoadRoots S 0 1900 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.061970] SysProxySetting S 0 1901 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.062477] dconf worker S 0 1902 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.063222] ProxyResolution S 0 1903 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.063727] DataStorage S 0 1904 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.064175] URL Classifier S 0 1905 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.064680] Classif~ Update S 0 1906 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.065182] DataStorage S 0 1908 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.065718] DataStorage S 0 1909 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.066151] SaveScripts S 0 1910 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.066684] Cache I/O S 0 1911 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.067149] mozStorage #1 S 0 1913 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.067693] mozStorage #2 S 0 1916 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.068222] QuotaManager IO S 0 1917 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.068721] mozStorage #3 S 0 1918 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.069210] mozStorage #4 S 0 1919 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.069714] mozStorage #5 S 0 1922 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.070242] DOM Worker S 0 1923 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.070743] DOM Worker S 0 1947 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.071272] IdentityCrypto S 0 1967 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.071799] mozStorage #7 S 0 1976 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.072267] mozStorage #8 S 0 1978 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.072775] DNS Resolver #7 S 0 2265 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.073256] DNS Resolver #9 S 0 2860 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.073763] DNS Res~ver #10 S 0 2861 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.074266] DNS Res~ver #11 S 0 2862 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.074765] speechd init S 0 2894 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.075268] BgFileSaver S 0 2916 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.075779] mozStorage #9 S 0 2919 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.076270] DOMCacheThread S 0 2939 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.076793] Web Content S 0 1852 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.077632] Chrome_~dThread S 0 1855 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.078069] JS Watchdog S 0 1858 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.078634] JS Helper S 0 1859 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.079164] JS Helper S 0 1860 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.079689] JS Helper S 0 1861 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.080219] JS Helper S 0 1862 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.080785] JS Helper S 0 1863 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.081369] JS Helper S 0 1864 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.081901] JS Helper S 0 1865 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.082450] JS Helper S 0 1866 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.082964] JS Helper S 0 1867 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.083507] JS Helper S 0 1868 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.084043] JS Helper S 0 1869 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.084610] JS Helper S 0 1870 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.085146] Socket Thread S 0 1871 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.085872] Hang Monitor S 0 1872 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.086379] Timer S 0 1873 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.086886] ImgDecoder #1 S 0 1874 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.087411] ImgDecoder #2 S 0 1875 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.087960] ImgDecoder #3 S 0 1876 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.088527] ImgDecoder #4 S 0 1877 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.089036] ImgDecoder #5 S 0 1878 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.089578] ImgDecoder #6 S 0 1879 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.090130] ImgDecoder #7 S 0 1880 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.090673] ImageIO S 0 1881 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.091220] ImageBr~geChild S 0 1882 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.092005] VideoChild S 0 1883 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.092782] threaded-ml S 0 1887 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.093679] ProcessHangMon S 0 1888 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.094371] ProfilerChild S 0 1889 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.094984] gmain S 0 1890 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.095822] gdbus S 0 1891 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.096438] StyleThread#0 S 0 1893 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.096909] StyleThread#1 S 0 1894 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.097453] StyleThread#2 S 0 1895 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.098059] StyleThread#3 S 0 1896 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.098717] StyleThread#4 S 0 1897 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.099407] StyleThread#5 S 0 1898 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.100011] HTML5 Parser S 0 1914 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.100616] dconf worker S 0 1979 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.101536] MediaPl~ack #13 S 0 2853 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.102052] MediaPl~ack #14 S 0 2854 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.102605] DOM Worker S 0 2889 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.103124] DOM Worker S 0 2893 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.103708] MediaTimer #3 S 0 2898 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.104244] MediaPl~ack #17 S 0 2900 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.104802] MediaPl~ack #18 S 0 2901 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.105328] MediaPD~oder #6 S 0 2902 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.105835] MediaPD~oder #7 S 0 2903 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.106378] MediaPD~oder #8 S 0 2904 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.106883] MediaPD~oder #9 S 0 2905 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.107405] DOM Worker S 0 2938 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.107937] SubtleCrypto #1 S 0 2947 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.108457] StreamTrans #16 S 0 2954 1809 0x00000100
> Jan 10 17:56:20 darkbook kernel: [ 2819.109021] fish S 0 2165 1422 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.109522] ssh S 0 2214 2165 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.110386] kworker/0:4 I 0 2327 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.110599] xfrun4 S 0 2329 1127 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.111390] gmain S 0 2330 1127 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.112123] gdbus S 0 2331 1127 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.112797] xmms S 0 2337 2329 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.113584] xmms S 0 2338 2329 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.114426] xmms S 0 2339 2329 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.114842] xmms S 0 2340 2329 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.115265] xmms S 0 2345 2329 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.116489] xmms S 0 2847 2329 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.117433] threaded-ml S 0 2848 2329 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.118185] xmms S 0 2849 2329 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.118992] kworker/0:6 I 0 2346 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.119203] kworker/0:14 I 0 2362 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.119424] fish S 0 2414 1422 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.120179] kworker/u16:1 I 0 2455 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.120408] kworker/0:23 I 0 2520 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.120617] kworker/0:25 I 0 2540 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.120821] kworker/u16:0 I 0 2641 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.121027] kworker/2:1 I 0 2763 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.121231] kworker/0:0 I 0 2782 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.121451] kworker/0:1 I 0 2850 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.121657] kworker/0:2 I 0 2866 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.121861] kworker/0:3 I 0 2867 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.122066] kworker/2:0 I 0 2877 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.122273] kworker/0:5 I 0 2890 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.122495] kworker/0:7 I 0 2908 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.122705] kworker/0:8 I 0 2914 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.122910] kworker/0:9 I 0 2944 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.123115] kworker/0:10 I 0 2945 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.123335] kworker/0:13 I 0 2978 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.123543] kworker/0:15 I 0 2980 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.123749] xterm S 0 2981 1126 0x00000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.124568] kworker/0:16 I 0 2984 2 0x80000000
> Jan 10 17:56:20 darkbook kernel: [ 2819.124775] kworker/0:17 I 0 2987 2 0x80000000
> Jan 10 17:56:21 darkbook kernel: [ 2819.173457] Showing busy workqueues and worker pools:
> Jan 10 17:56:21 darkbook kernel: [ 2819.173480] workqueue events_freezable: flags=0x4
> Jan 10 17:56:21 darkbook kernel: [ 2819.173502] pwq 4: cpus=2 node=0 flags=0x0 nice=0 active=1/256
> Jan 10 17:56:21 darkbook kernel: [ 2819.173540] in-flight: 1635:mmc_rescan
> Jan 10 17:56:21 darkbook kernel: [ 2819.173599] pool 4: cpus=2 node=0 flags=0x0 nice=0 hung=0s workers=3 idle: 2877 2763
> Jan 10 17:56:21 darkbook kernel: [ 2820.056697] sysrq: SysRq : Show clockevent devices & pending hrtimers (no others)
> Jan 10 17:56:23 darkbook kernel: [ 2821.458675] sysrq: SysRq : Show Regs
> Jan 10 17:56:23 darkbook kernel: [ 2821.459453]
> Jan 10 17:56:23 darkbook kernel: [ 2821.459464] CPU#0: ctrl: 000000000000000f
> Jan 10 17:56:23 darkbook kernel: [ 2821.459482] CPU#0: status: 8000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459500] CPU#0: overflow: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459518] CPU#0: fixed: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459537] CPU#0: pebs: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459555] CPU#0: debugctl: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459573] CPU#0: active: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459592] CPU#0: gen-PMC0 ctrl: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459611] CPU#0: gen-PMC0 count: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459630] CPU#0: gen-PMC0 left: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459650] CPU#0: gen-PMC1 ctrl: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459670] CPU#0: gen-PMC1 count: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459689] CPU#0: gen-PMC1 left: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459709] CPU#0: gen-PMC2 ctrl: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459728] CPU#0: gen-PMC2 count: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459748] CPU#0: gen-PMC2 left: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459767] CPU#0: gen-PMC3 ctrl: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459787] CPU#0: gen-PMC3 count: 000000000000ffff
> Jan 10 17:56:23 darkbook kernel: [ 2821.459806] CPU#0: gen-PMC3 left: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459826] CPU#0: fixed-PMC0 count: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459846] CPU#0: fixed-PMC1 count: 0000000000000000
> Jan 10 17:56:23 darkbook kernel: [ 2821.459866] CPU#0: fixed-PMC2 count: 0000000000000000
> Jan 10 17:56:24 darkbook kernel: [ 2822.972704] sysrq: SysRq : Show Memory
> Jan 10 17:56:24 darkbook kernel: [ 2822.973707] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB
> Jan 10 17:56:28 darkbook kernel: [ 2827.075135] sysrq: SysRq : Emergency Sync
> Jan 10 17:56:31 darkbook exiting on signal 15
> ===
>
> The last one is me issuing a terminate-all-tasks so I can safely reboot.
>
> This is a regular build with many tracing/tracers options plus some
> debugging info. It is available at <http://rnsanchez.wait4.org/config-4.14>,
> if you need it.
>
> Let me know if you need more info.
>
> Cheers,
>
Some context of this problem :
commit 29869d66870a715177bfb505f66a7e0e8bcc89c3
Author: Eric Dumazet <edumazet@...gle.com>
Date: Tue Feb 21 06:21:47 2017 -0800
tcp: Revert "tcp: tcp_probe: use spin_lock_bh()"
This reverts commit e70ac171658679ecf6bea4bbd9e9325cd6079d2b.
jtcp_rcv_established() is in fact called with hard irq being disabled.
Initial bug report from Ricardo Nabinger Sanchez [1] still needs
to be investigated, but does not look like a TCP bug.
[1] https://www.spinics.net/lists/netdev/msg420960.html
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: kernel test robot <xiaolong.ye@...el.com>
Cc: Ricardo Nabinger Sanchez <rnsanchez@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
commit e70ac171658679ecf6bea4bbd9e9325cd6079d2b
Author: Eric Dumazet <edumazet@...gle.com>
Date: Tue Feb 14 17:11:14 2017 -0800
tcp: tcp_probe: use spin_lock_bh()
tcp_rcv_established() can now run in process context.
We need to disable BH while acquiring tcp probe spinlock,
or risk a deadlock.
Fixes: 5413d1babe8f ("net: do not block BH while processing socket backlog")
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
Reported-by: Ricardo Nabinger Sanchez <rnsanchez@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
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