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Date: Tue, 19 Nov 2019 18:11:46 +0200
From: Meelis Roos <mroos@...ux.ee>
To: LKML <linux-kernel@...r.kernel.org>,
"sparclinux@...r.kernel.org" <sparclinux@...r.kernel.org>,
netdev@...r.kernel.org
Subject: Re: 5.4-rc8 OOPS from bpf now
19.11.19 16:02 I wrote:
> I changed the kernel config in semi-random ways and retried. This results in a different crash, in BPF.
> This is similar to a yet-unreported problem that I am trying to debug on Ultra 45 with 5.4-git.
[...]
> Kernel config now (CONFIG_JUMP_LABEL seems the most outstanding change?)
I turned off just CONFIG_JUMP_LABEL and tried again, and got a third kind of oops from
softirq and RCU code, during dpkg --configure rsyslog - so it looks like BPF was hit like a bystander?
[ 114.436832] Unable to handle kernel NULL pointer dereference
[ 114.511243] tsk->{mm,active_mm}->context = 0000000000000001
[ 114.553985] Kernel unaligned access at TPC[55a9f4] anon_vma_interval_tree_insert+0x34/0xe0
[ 114.584446] tsk->{mm,active_mm}->pgd = fff000133c97e000
[ 114.584449] \|/ ____ \|/
[ 114.584449] "@'/ .. \`@"
[ 114.584449] /_| \__/ |_\
[ 114.584449] \__U_/
[ 114.584453] ksoftirqd/0(16): Oops [#1]
[ 114.584464] CPU: 0 PID: 16 Comm: ksoftirqd/0 Not tainted 5.4.0-rc8 #14
[ 115.090062] TSTATE: 0000009980001607 TPC: 00000000004f8d20 TNPC: 00000000004f8d24 Y: 00000000 Not tainted
[ 115.219328] TPC: <__bpf_prog_put_rcu+0x80/0xc0>
[ 115.278884] g0: 0000000000000000 g1: 00000001000a0000 g2: 0000000000000000 g3: 0000000000000000
[ 115.393260] g4: fff000133c12f7e0 g5: fff000133ec92000 g6: fff000133c17c000 g7: 000c00002b4b7c10
[ 115.507646] o0: 0000000000000000 o1: 0000000000000000 o2: 00000000004bab4c o3: 000bffffffc8b048
[ 115.622014] o4: fff000133ec92000 o5: 001bffecc0ff9048 sp: fff000133c17f241 ret_pc: 00000000004f8d10
[ 115.740965] RPC: <__bpf_prog_put_rcu+0x70/0xc0>
[ 115.800435] l0: 0000000000a5c328 l1: 0000000000b36400 l2: 0000000000000001 l3: 0000000000a670b0
[ 115.914854] l4: fff000133c00c168 l5: 0000000000000002 l6: ffffffffffffffc8 l7: fff000133c00d028
[ 116.029294] i0: fff000133dcf7900 i1: fff000133dfe5b00 i2: 0000000000001a31 i3: 0000000000000000
[ 116.143661] i4: fff000133f80a3d0 i5: 0000000000000000 i6: fff000133c17f2f1 i7: 00000000004bab4c
[ 116.258039] I7: <rcu_core+0x1cc/0x540>
[ 116.307208] Call Trace:
[ 116.339235] [00000000004bab4c] rcu_core+0x1cc/0x540
[ 116.404439] [000000000095a398] __do_softirq+0xd8/0x240
[ 116.473055] [000000000046708c] run_ksoftirqd+0x2c/0x40
[ 116.541680] [0000000000484e24] smpboot_thread_fn+0x164/0x1e0
[ 116.617178] [0000000000481c5c] kthread+0xfc/0x120
[ 116.680077] [00000000004060a4] ret_from_fork+0x1c/0x2c
[ 116.748696] [0000000000000000] 0x0
[ 116.794441] Disabling lock debugging due to kernel taint
[ 116.864213] Caller[00000000004bab4c]: rcu_core+0x1cc/0x540
[ 116.936268] Caller[000000000095a398]: __do_softirq+0xd8/0x240
[ 117.011764] Caller[000000000046708c]: run_ksoftirqd+0x2c/0x40
[ 117.087242] Caller[0000000000484e24]: smpboot_thread_fn+0x164/0x1e0
[ 117.169592] Caller[0000000000481c5c]: kthread+0xfc/0x120
[ 117.239358] Caller[00000000004060a4]: ret_from_fork+0x1c/0x2c
[ 117.314845] Caller[0000000000000000]: 0x0
[ 117.367456] Instruction DUMP:
[ 117.367458] d05e3f80
[ 117.406341] c25e3f88
[ 117.437223] c4586020
[ 117.468102] <fa58a090>
[ 117.498985] 02c74005
[ 117.529864] 01000000
[ 117.560747] d0104000
[ 117.591628] 40114967
[ 117.622509] 92076050
[ 117.653387]
[ 117.703710] Kernel panic - not syncing: Aiee, killing interrupt handler!
[ 117.791776] ------------[ cut here ]------------
[ 117.852403] WARNING: CPU: 0 PID: 16 at kernel/smp.c:433 smp_call_function_many+0x350/0x380
[ 117.961047] Modules linked in: tg3 i2c_ali15x3 hwmon i2c_ali1535 flash i2c_core autofs4
[ 118.066275] CPU: 0 PID: 16 Comm: ksoftirqd/0 Tainted: G D 5.4.0-rc8 #14
[ 118.170351] Call Trace:
[ 118.202382] [0000000000462fc4] __warn+0x94/0xb0
[ 118.262994] [0000000000463010] warn_slowpath_fmt+0x30/0x80
[ 118.336194] [00000000004d6750] smp_call_function_many+0x350/0x380
[ 118.417399] [00000000004d6798] smp_call_function+0x18/0x40
[ 118.490597] [0000000000462d0c] panic+0x10c/0x330
[ 118.552361] [00000000004666f4] do_exit+0xa14/0xaa0
[ 118.616412] [000000000042b08c] die_if_kernel+0x1ec/0x258
[ 118.687322] [0000000000450600] unhandled_fault+0x80/0xa0
[ 118.758232] [000000000045039c] do_sparc64_fault+0x5fc/0x7e0
[ 118.832579] [00000000004076f4] sparc64_realfault_common+0x10/0x20
[ 118.913783] [00000000004f8d20] __bpf_prog_put_rcu+0x80/0xc0
[ 118.988124] [00000000004bab4c] rcu_core+0x1cc/0x540
[ 119.053318] [000000000095a398] __do_softirq+0xd8/0x240
[ 119.121941] [000000000046708c] run_ksoftirqd+0x2c/0x40
[ 119.190566] [0000000000484e24] smpboot_thread_fn+0x164/0x1e0
[ 119.266054] [0000000000481c5c] kthread+0xfc/0x120
[ 119.328957] ---[ end trace 66b937e7760cb8cf ]---
[ 119.389577] ------------[ cut here ]------------
[ 119.450195] WARNING: CPU: 0 PID: 16 at kernel/smp.c:300 smp_call_function_single+0x168/0x1a0
[ 119.561139] Modules linked in: tg3 i2c_ali15x3 hwmon i2c_ali1535 flash i2c_core autofs4
[ 119.666365] CPU: 0 PID: 16 Comm: ksoftirqd/0 Tainted: G D W 5.4.0-rc8 #14
[ 119.770442] Call Trace:
[ 119.802465] [0000000000462fc4] __warn+0x94/0xb0
[ 119.863084] [0000000000463010] warn_slowpath_fmt+0x30/0x80
[ 119.936286] [00000000004d61c8] smp_call_function_single+0x168/0x1a0
[ 120.019779] [00000000004d6798] smp_call_function+0x18/0x40
[ 120.092978] [0000000000462d0c] panic+0x10c/0x330
[ 120.154738] [00000000004666f4] do_exit+0xa14/0xaa0
[ 120.218787] [000000000042b08c] die_if_kernel+0x1ec/0x258
[ 120.289700] [0000000000450600] unhandled_fault+0x80/0xa0
[ 120.360612] [000000000045039c] do_sparc64_fault+0x5fc/0x7e0
[ 120.434956] [00000000004076f4] sparc64_realfault_common+0x10/0x20
[ 120.516162] [00000000004f8d20] __bpf_prog_put_rcu+0x80/0xc0
[ 120.590503] [00000000004bab4c] rcu_core+0x1cc/0x540
[ 120.655698] [000000000095a398] __do_softirq+0xd8/0x240
[ 120.724320] [000000000046708c] run_ksoftirqd+0x2c/0x40
[ 120.792946] [0000000000484e24] smpboot_thread_fn+0x164/0x1e0
[ 120.868432] [0000000000481c5c] kthread+0xfc/0x120
[ 120.931337] ---[ end trace 66b937e7760cb8d0 ]---
[ 120.991962] Press Stop-A (L1-A) from sun keyboard or send break
[ 120.991962] twice on console to return to the boot prom
[ 121.138356] ---[ end Kernel panic - not syncing: Aiee, killing interrupt handler! ]---
--
Meelis Roos <mroos@...ux.ee>
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