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Message-ID: <000000000000f4116605ea324e13@google.com> Date: Tue, 04 Oct 2022 02:44:37 -0700 From: syzbot <syzbot+9e255dc219e012cdee75@...kaller.appspotmail.com> To: davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org, linux-hams@...r.kernel.org, linux-kernel@...r.kernel.org, netdev@...r.kernel.org, pabeni@...hat.com, ralf@...ux-mips.org, syzkaller-bugs@...glegroups.com Subject: [syzbot] WARNING: locking bug in nr_accept Hello, syzbot found the following issue on: HEAD commit: 5911b92626df Merge branch 'for-next/core' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=10eecbff080000 kernel config: https://syzkaller.appspot.com/x/.config?x=aae2d21e7dd80684 dashboard link: https://syzkaller.appspot.com/bug?extid=9e255dc219e012cdee75 compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/c50e57f66737/disk-5911b926.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/f369b7b837e3/vmlinux-5911b926.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+9e255dc219e012cdee75@...kaller.appspotmail.com ------------[ cut here ]------------ DEBUG_LOCKS_WARN_ON(1) WARNING: CPU: 0 PID: 12189 at kernel/locking/lockdep.c:231 check_wait_context kernel/locking/lockdep.c:4727 [inline] WARNING: CPU: 0 PID: 12189 at kernel/locking/lockdep.c:231 __lock_acquire+0x2b0/0x30a4 kernel/locking/lockdep.c:5003 Modules linked in: CPU: 0 PID: 12189 Comm: syz-executor.0 Not tainted 6.0.0-rc7-syzkaller-18098-g5911b92626df #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4727 [inline] pc : __lock_acquire+0x2b0/0x30a4 kernel/locking/lockdep.c:5003 lr : hlock_class kernel/locking/lockdep.c:231 [inline] lr : check_wait_context kernel/locking/lockdep.c:4727 [inline] lr : __lock_acquire+0x298/0x30a4 kernel/locking/lockdep.c:5003 sp : ffff800012dfba30 x29: ffff800012dfbb10 x28: 0000000000000000 x27: ffff0000e8b44f80 x26: ffff0000f17c3130 x25: ffff0000e8b459b0 x24: 0000000000000000 x23: 0000000000000000 x22: 0000000000000001 x21: 0000000000000000 x20: 0000000000000000 x19: aaaaab5555430f3e x18: 000000000000013d x17: ffff80000bffd6bc x16: ffff80000db49158 x15: ffff0000e8b44f80 x14: 0000000000000000 x13: 0000000000000012 x12: 0000000000040000 x11: 0000000000005336 x10: ffff80000dd0b198 x9 : fa0a257453282b00 x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff80000819545c x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000016 Call trace: check_wait_context kernel/locking/lockdep.c:4727 [inline] __lock_acquire+0x2b0/0x30a4 kernel/locking/lockdep.c:5003 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 lock_sock_nested+0x70/0xd8 net/core/sock.c:3393 lock_sock include/net/sock.h:1712 [inline] nr_accept+0x1ac/0x250 net/netrom/af_netrom.c:805 do_accept+0x1d8/0x274 net/socket.c:1856 __sys_accept4_file net/socket.c:1897 [inline] __sys_accept4+0xb4/0x12c net/socket.c:1927 __do_sys_accept net/socket.c:1944 [inline] __se_sys_accept net/socket.c:1941 [inline] __arm64_sys_accept+0x28/0x3c net/socket.c:1941 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 irq event stamp: 1543 hardirqs last enabled at (1543): [<ffff800008161dac>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1367 [inline] hardirqs last enabled at (1543): [<ffff800008161dac>] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:4942 hardirqs last disabled at (1542): [<ffff80000bfc0a34>] __schedule+0x84/0x5a0 kernel/sched/core.c:6393 softirqs last enabled at (1534): [<ffff80000b1bce74>] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (1534): [<ffff80000b1bce74>] release_sock+0xf4/0x108 net/core/sock.c:3419 softirqs last disabled at (1532): [<ffff80000b1bcdac>] spin_lock_bh include/linux/spinlock.h:354 [inline] softirqs last disabled at (1532): [<ffff80000b1bcdac>] release_sock+0x2c/0x108 net/core/sock.c:3406 ---[ end trace 0000000000000000 ]--- BUG: sleeping function called from invalid context at arch/arm64/mm/fault.c:593 in_atomic(): 0, irqs_disabled(): 128, non_block: 0, pid: 12189, name: syz-executor.0 preempt_count: 0, expected: 0 RCU nest depth: 0, expected: 0 INFO: lockdep is turned off. irq event stamp: 1543 hardirqs last enabled at (1543): [<ffff800008161dac>] raw_spin_rq_unlock_irq kernel/sched/sched.h:1367 [inline] hardirqs last enabled at (1543): [<ffff800008161dac>] finish_lock_switch+0x94/0xe8 kernel/sched/core.c:4942 hardirqs last disabled at (1542): [<ffff80000bfc0a34>] __schedule+0x84/0x5a0 kernel/sched/core.c:6393 softirqs last enabled at (1534): [<ffff80000b1bce74>] spin_unlock_bh include/linux/spinlock.h:394 [inline] softirqs last enabled at (1534): [<ffff80000b1bce74>] release_sock+0xf4/0x108 net/core/sock.c:3419 softirqs last disabled at (1532): [<ffff80000b1bcdac>] spin_lock_bh include/linux/spinlock.h:354 [inline] softirqs last disabled at (1532): [<ffff80000b1bcdac>] release_sock+0x2c/0x108 net/core/sock.c:3406 CPU: 0 PID: 12189 Comm: syz-executor.0 Tainted: G W 6.0.0-rc7-syzkaller-18098-g5911b92626df #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 __might_resched+0x208/0x218 kernel/sched/core.c:9892 __might_sleep+0x48/0x78 kernel/sched/core.c:9821 do_page_fault+0x214/0x79c arch/arm64/mm/fault.c:593 do_translation_fault+0x78/0x194 arch/arm64/mm/fault.c:685 do_mem_abort+0x54/0x130 arch/arm64/mm/fault.c:821 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:366 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:426 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576 hlock_class kernel/locking/lockdep.c:222 [inline] check_wait_context kernel/locking/lockdep.c:4728 [inline] __lock_acquire+0x2d0/0x30a4 kernel/locking/lockdep.c:5003 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 lock_sock_nested+0x70/0xd8 net/core/sock.c:3393 lock_sock include/net/sock.h:1712 [inline] nr_accept+0x1ac/0x250 net/netrom/af_netrom.c:805 do_accept+0x1d8/0x274 net/socket.c:1856 __sys_accept4_file net/socket.c:1897 [inline] __sys_accept4+0xb4/0x12c net/socket.c:1927 __do_sys_accept net/socket.c:1944 [inline] __se_sys_accept net/socket.c:1941 [inline] __arm64_sys_accept+0x28/0x3c net/socket.c:1941 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Unable to handle kernel NULL pointer dereference at virtual address 00000000000000b8 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=00000001291bb000 [00000000000000b8] pgd=080000012933e003, p4d=080000012933e003, pud=080000012ab9a003, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 12189 Comm: syz-executor.0 Tainted: G W 6.0.0-rc7-syzkaller-18098-g5911b92626df #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022 pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : check_wait_context kernel/locking/lockdep.c:4727 [inline] pc : __lock_acquire+0x2d0/0x30a4 kernel/locking/lockdep.c:5003 lr : hlock_class kernel/locking/lockdep.c:231 [inline] lr : check_wait_context kernel/locking/lockdep.c:4727 [inline] lr : __lock_acquire+0x298/0x30a4 kernel/locking/lockdep.c:5003 sp : ffff800012dfba30 x29: ffff800012dfbb10 x28: 0000000000000000 x27: ffff0000e8b44f80 x26: ffff0000f17c3130 x25: ffff0000e8b459b0 x24: 0000000000000000 x23: 0000000000000000 x22: 0000000000000001 x21: 0000000000000000 x20: 0000000000000000 x19: aaaaab5555430f3e x18: 000000000000013d x17: ffff80000bffd6bc x16: ffff80000db49158 x15: ffff0000e8b44f80 x14: 0000000000000000 x13: 0000000000000012 x12: 0000000000040000 x11: 0000000000005336 x10: ffff80000dd0b198 x9 : 0000000000040f3e x8 : 0000000000000000 x7 : 4e5241575f534b43 x6 : ffff80000819545c x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000100000000 x0 : 0000000000000016 Call trace: hlock_class kernel/locking/lockdep.c:222 [inline] check_wait_context kernel/locking/lockdep.c:4728 [inline] __lock_acquire+0x2d0/0x30a4 kernel/locking/lockdep.c:5003 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 lock_sock_nested+0x70/0xd8 net/core/sock.c:3393 lock_sock include/net/sock.h:1712 [inline] nr_accept+0x1ac/0x250 net/netrom/af_netrom.c:805 do_accept+0x1d8/0x274 net/socket.c:1856 __sys_accept4_file net/socket.c:1897 [inline] __sys_accept4+0xb4/0x12c net/socket.c:1927 __do_sys_accept net/socket.c:1944 [inline] __se_sys_accept net/socket.c:1941 [inline] __arm64_sys_accept+0x28/0x3c net/socket.c:1941 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Code: b002db8a 91056210 9106614a b9400329 (3942e114) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: b002db8a adrp x10, 0x5b71000 4: 91056210 add x16, x16, #0x158 8: 9106614a add x10, x10, #0x198 c: b9400329 ldr w9, [x25] * 10: 3942e114 ldrb w20, [x8, #184] <-- trapping instruction --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@...glegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
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