INFO: task syz-executor488:6806 blocked for more than 143 seconds. Not tainted 5.8.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor488 D28368 6806 6800 0x80004002 Call Trace: context_switch kernel/sched/core.c:3778 [inline] __schedule+0x979/0xce0 kernel/sched/core.c:4527 Showing all locks held in the system: 1 lock held by khungtaskd/1166: #0: ffffffff894fe1d0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire+0x0/0x30 arch/x86/pci/mmconfig_64.c:151 1 lock held by in:imklog/6486: #0: ffff88809946b870 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x253/0x2f0 fs/file.c:930 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1166 Comm: khungtaskd Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1f0/0x31e lib/dump_stack.c:118 nmi_cpu_backtrace+0x9f/0x180 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:209 [inline] watchdog+0xd65/0xdb0 kernel/hung_task.c:295 kthread+0x37e/0x3a0 drivers/block/aoe/aoecmd.c:1234 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 3897 Comm: systemd-journal Not tainted 5.8.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline] RIP: 0010:write_comp_data kernel/kcov.c:217 [inline] RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x4/0xa0 kernel/kcov.c:284 Code: c1 e0 03 48 83 c8 18 48 89 34 01 4c 89 44 f9 18 49 ff c2 4c 89 11 c3 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 4c 8b 04 24 <65> 48 8b 14 25 00 fe 01 00 65 8b 05 a8 0b 8d 7e a9 00 01 ff 00 74 RSP: 0018:ffffc900054e7ae8 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff8880a928a200 RDX: ffff8880a928a200 RSI: 0000000000000000 RDI: 0000000000000000 RBP: 0000000000000001 R08: ffffffff83618087 R09: ffffc900054e7bc8 R10: fffff52000a9cf7d R11: 0000000000000000 R12: ffffffff890a72d3 R13: 0000000000000000 R14: ffffc900054e7ba0 R15: ffffffff890a72d3 FS: 00007f91708398c0(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f916dbd6000 CR3: 0000000092812000 CR4: 00000000001506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: smack_log+0x87/0x490 security/smack/smack_access.c:354 smk_tskacc+0x2e5/0x390 security/smack/smack_access.c:254 smack_inode_permission+0x241/0x2b0 security/smack/smack_lsm.c:1182 security_inode_permission+0x92/0x110 security/security.c:1258 may_lookup fs/namei.c:1575 [inline] link_path_walk+0x20e/0xba0 fs/namei.c:2125 path_lookupat+0xab/0x960 fs/namei.c:2332 filename_lookup+0x1ab/0x5d0 fs/namei.c:2366 user_path_at include/linux/namei.h:59 [inline] do_faccessat+0x3a0/0x870 fs/open.c:423 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f916faf59c7 Code: 83 c4 08 48 3d 01 f0 ff ff 73 01 c3 48 8b 0d c8 d4 2b 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 b8 15 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d a1 d4 2b 00 f7 d8 64 89 01 48 RSP: 002b:00007fffc39a1ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000015 RAX: ffffffffffffffda RBX: 00007fffc39a4c00 RCX: 00007f916faf59c7 RDX: 00007f9170566a00 RSI: 0000000000000000 RDI: 00005610c43429a3 RBP: 00007fffc39a1d20 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000069 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000000 R14: 00007fffc39a4c00 R15: 00007fffc39a2210