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Date: Fri, 26 Apr 2024 06:12:03 -0700 From: syzbot <syzbot+159077b1355b8cd72757@...kaller.appspotmail.com> To: hdanton@...a.com, linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com Subject: Re: [syzbot] [input?] [ext4?] possible deadlock in uinput_request_submit Hello, syzbot has tested the proposed patch but the reproducer is still triggering an issue: INFO: trying to register non-static key in uinput_destroy_device input: syz1 as /devices/virtual/input/input6070 INFO: trying to register non-static key. The code is fine but needs lockdep annotation, or maybe you didn't initialize this object before use? turning off the locking correctness validator. CPU: 0 PID: 21743 Comm: syz-executor144 Not tainted 6.9.0-rc4-next-20240418-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:114 assign_lock_key+0x238/0x270 kernel/locking/lockdep.c:976 register_lock_class+0x1cf/0x980 kernel/locking/lockdep.c:1289 __lock_acquire+0xda/0x1fd0 kernel/locking/lockdep.c:5014 lock_acquire+0x1ed/0x550 kernel/locking/lockdep.c:5754 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0xd5/0x120 kernel/locking/spinlock.c:162 complete_with_flags kernel/sched/completion.c:20 [inline] complete+0x28/0x1c0 kernel/sched/completion.c:47 uinput_flush_requests drivers/input/misc/uinput.c:213 [inline] uinput_destroy_device+0x129/0x8f0 drivers/input/misc/uinput.c:298 uinput_release+0x3e/0x50 drivers/input/misc/uinput.c:751 __fput+0x406/0x8b0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1b/0x27e0 kernel/exit.c:877 do_group_exit+0x207/0x2c0 kernel/exit.c:1026 __do_sys_exit_group kernel/exit.c:1037 [inline] __se_sys_exit_group kernel/exit.c:1035 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1035 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb846ea6639 Code: Unable to access opcode bytes at 0x7fb846ea660f. RSP: 002b:00007fff8074c3d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb846ea6639 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007fb846f222d0 R08: ffffffffffffffb8 R09: 000000000000046f R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb846f222d0 R13: 0000000000000000 R14: 00007fb846f23040 R15: 00007fb846e74780 </TASK> BUG: unable to handle page fault for address: fffffffffffffff8 #PF: supervisor read access in kernel mode #PF: error_code(0x0000) - not-present page PGD e136067 P4D e136067 PUD e138067 PMD 0 Oops: Oops: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 0 PID: 21743 Comm: syz-executor144 Not tainted 6.9.0-rc4-next-20240418-syzkaller-dirty #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:swake_up_locked kernel/sched/swait.c:29 [inline] RIP: 0010:complete_with_flags kernel/sched/completion.c:24 [inline] RIP: 0010:complete+0x9b/0x1c0 kernel/sched/completion.c:47 Code: df e8 39 fd 8b 00 4c 8b 23 49 39 dc 0f 84 e2 00 00 00 49 8d 7c 24 f8 48 89 f8 48 c1 e8 03 42 80 3c 30 00 74 05 e8 15 fd 8b 00 <49> 8b 7c 24 f8 be 03 00 00 00 31 d2 e8 04 e5 f6 ff 4c 89 e7 e8 3c RSP: 0018:ffffc9000a91fb30 EFLAGS: 00010046 RAX: 1fffffffffffffff RBX: ffffc9000b477af8 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: 0000000000000004 RDI: fffffffffffffff8 RBP: 1ffff9200168ef56 R08: 0000000000000003 R09: fffff52001523f40 R10: dffffc0000000000 R11: fffff52001523f40 R12: 0000000000000000 R13: 0000000000000246 R14: dffffc0000000000 R15: ffffc9000b477ab8 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffff8 CR3: 0000000024bc2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> uinput_flush_requests drivers/input/misc/uinput.c:213 [inline] uinput_destroy_device+0x129/0x8f0 drivers/input/misc/uinput.c:298 uinput_release+0x3e/0x50 drivers/input/misc/uinput.c:751 __fput+0x406/0x8b0 fs/file_table.c:422 task_work_run+0x24f/0x310 kernel/task_work.c:180 exit_task_work include/linux/task_work.h:38 [inline] do_exit+0xa1b/0x27e0 kernel/exit.c:877 do_group_exit+0x207/0x2c0 kernel/exit.c:1026 __do_sys_exit_group kernel/exit.c:1037 [inline] __se_sys_exit_group kernel/exit.c:1035 [inline] __x64_sys_exit_group+0x3f/0x40 kernel/exit.c:1035 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fb846ea6639 Code: Unable to access opcode bytes at 0x7fb846ea660f. RSP: 002b:00007fff8074c3d8 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7 RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00007fb846ea6639 RDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000000 RBP: 00007fb846f222d0 R08: ffffffffffffffb8 R09: 000000000000046f R10: 0000000000000000 R11: 0000000000000246 R12: 00007fb846f222d0 R13: 0000000000000000 R14: 00007fb846f23040 R15: 00007fb846e74780 </TASK> Modules linked in: CR2: fffffffffffffff8 ---[ end trace 0000000000000000 ]--- RIP: 0010:swake_up_locked kernel/sched/swait.c:29 [inline] RIP: 0010:complete_with_flags kernel/sched/completion.c:24 [inline] RIP: 0010:complete+0x9b/0x1c0 kernel/sched/completion.c:47 Code: df e8 39 fd 8b 00 4c 8b 23 49 39 dc 0f 84 e2 00 00 00 49 8d 7c 24 f8 48 89 f8 48 c1 e8 03 42 80 3c 30 00 74 05 e8 15 fd 8b 00 <49> 8b 7c 24 f8 be 03 00 00 00 31 d2 e8 04 e5 f6 ff 4c 89 e7 e8 3c RSP: 0018:ffffc9000a91fb30 EFLAGS: 00010046 RAX: 1fffffffffffffff RBX: ffffc9000b477af8 RCX: 0000000000000001 RDX: dffffc0000000000 RSI: 0000000000000004 RDI: fffffffffffffff8 RBP: 1ffff9200168ef56 R08: 0000000000000003 R09: fffff52001523f40 R10: dffffc0000000000 R11: fffff52001523f40 R12: 0000000000000000 R13: 0000000000000246 R14: dffffc0000000000 R15: ffffc9000b477ab8 FS: 0000000000000000(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: fffffffffffffff8 CR3: 0000000024bc2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: df e8 fucomip %st(0),%st 2: 39 fd cmp %edi,%ebp 4: 8b 00 mov (%rax),%eax 6: 4c 8b 23 mov (%rbx),%r12 9: 49 39 dc cmp %rbx,%r12 c: 0f 84 e2 00 00 00 je 0xf4 12: 49 8d 7c 24 f8 lea -0x8(%r12),%rdi 17: 48 89 f8 mov %rdi,%rax 1a: 48 c1 e8 03 shr $0x3,%rax 1e: 42 80 3c 30 00 cmpb $0x0,(%rax,%r14,1) 23: 74 05 je 0x2a 25: e8 15 fd 8b 00 call 0x8bfd3f * 2a: 49 8b 7c 24 f8 mov -0x8(%r12),%rdi <-- trapping instruction 2f: be 03 00 00 00 mov $0x3,%esi 34: 31 d2 xor %edx,%edx 36: e8 04 e5 f6 ff call 0xfff6e53f 3b: 4c 89 e7 mov %r12,%rdi 3e: e8 .byte 0xe8 3f: 3c .byte 0x3c Tested on: commit: 7b4f2bc9 Add linux-next specific files for 20240418 git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git console output: https://syzkaller.appspot.com/x/log.txt?x=14aa5b27180000 kernel config: https://syzkaller.appspot.com/x/.config?x=ae644165a243bf62 dashboard link: https://syzkaller.appspot.com/bug?extid=159077b1355b8cd72757 compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 patch: https://syzkaller.appspot.com/x/patch.diff?x=179fc530980000
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