CR0: actual=0x0000000080000031, shadow=0x00000000e0000011, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000002060, shadow=0x0000000000000020, gh_mask=ffffffffffffe871 INFO: task syz-executor.4:21464 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 CR3 = 0x0000000000002000 RSP = 0x0000000000000f80 RIP = 0x000000000000003e "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. RFLAGS=0x00000096 DR7 = 0x0000000000000400 syz-executor.4 D29920 21464 8157 0x00000004 Sysenter RSP=0000000000000f80 CS:RIP=0050:0000000000002810 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 CS: sel=0x0050, attr=0x0209b, limit=0x0000ffff, base=0x0000000000000000 DS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 SS: sel=0x0000, attr=0x0c093, limit=0x00000fff, base=0x0000000000000000 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:292 [inline] rwsem_down_read_failed+0x20a/0x390 kernel/locking/rwsem-xadd.c:309 ES: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 FS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 call_rwsem_down_read_failed+0x14/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0x44/0x80 kernel/locking/rwsem.c:26 GS: sel=0x0038, attr=0x04093, limit=0x000fffff, base=0x0000000000000000 iterate_supers+0xdb/0x290 fs/super.c:631 GDTR: limit=0x000007ff, base=0x0000000000001000 ksys_sync+0x86/0x150 fs/sync.c:113 LDTR: sel=0x0008, attr=0x04082, limit=0x000007ff, base=0x0000000000001800 IDTR: limit=0x000001ff, base=0x0000000000003800 TR: sel=0x00d8, attr=0x0008b, limit=0x000001ff, base=0x0000000000003a00 __ia32_sys_sync+0xa/0x10 fs/sync.c:124 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 EFER = 0x0000000000000501 PAT = 0x0007040600070406 entry_SYSCALL_64_after_hwframe+0x49/0xbe DebugCtl = 0x0000000000000000 DebugExceptions = 0x0000000000000000 RIP: 0033:0x7f3fd4e450f9 Interruptibility = 00000002 ActivityState = 00000000 Code: Bad RIP value. *** Host State *** RIP = 0xffffffff811a9c2f RSP = 0xffff88804fe9f8c0 RSP: 002b:00007f3fd33b7168 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2 CS=0010 SS=0018 DS=0000 ES=0000 FS=0000 GS=0000 TR=0040 RAX: ffffffffffffffda RBX: 00007f3fd4f64f80 RCX: 00007f3fd4e450f9 FSBase=00007fdb5810f700 GSBase=ffff8880ba100000 TRBase=fffffe0000034000 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 GDTBase=fffffe0000032000 IDTBase=fffffe0000000000 RBP: 00007f3fd4ea0ae9 R08: 0000000000000000 R09: 0000000000000000 CR0=0000000080050033 CR3=000000004fc15000 CR4=00000000003426e0 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 Sysenter RSP=fffffe0000034000 CS:RIP=0010:ffffffff88201290 R13: 00007ffdd755c33f R14: 00007f3fd33b7300 R15: 0000000000022000 EFER = 0x0000000000000d01 PAT = 0x0407050600070106 Showing all locks held in the system: *** Control State *** PinBased=0000003f CPUBased=b5986dfa SecondaryExec=000000ea 1 lock held by khungtaskd/1571: EntryControls=0000d3ff ExitControls=002fefff #0: 000000000a6ed73c (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 ExceptionBitmap=00060042 PFECmask=00000000 PFECmatch=00000000 VMEntry: intr_info=80000202 errcode=00000000 ilen=00000000 VMExit: intr_info=00000000 errcode=00000000 ilen=00000003 1 lock held by in:imklog/7815: #0: 000000007db3383d (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767 reason=80000021 qualification=0000000000000000 3 locks held by kworker/u4:9/9867: 4 locks held by syz-executor.2/17076: IDTVectoring: info=00000000 errcode=00000000 4 locks held by syz-executor.3/16229: 1 lock held by syz-executor.4/21464: TSC Offset = 0xfffffce497867e52 #0: 00000000f955fddf (&type->s_umount_key#62){++++}, at: iterate_supers+0xdb/0x290 fs/super.c:631 EPT pointer = 0x000000004c65101e Virtual processor ID = 0x0002 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1571 Comm: khungtaskd Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x1fc/0x2ef lib/dump_stack.c:118 nmi_cpu_backtrace.cold+0x63/0xa2 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1a6/0x1f0 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x991/0xe60 kernel/hung_task.c:287 kthread+0x33f/0x460 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 27085 Comm: syz-executor.5 Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023 RIP: 0033:0x7f42dbddf1c4 Code: 39 c1 77 78 48 63 d5 48 01 c2 49 3b 55 08 77 56 8d 55 ff 85 ed 74 35 0f 1f 80 00 00 00 00 48 39 c1 77 1c 49 8b 75 00 49 89 c1 <49> 29 c9 46 0f b6 0c 0e 45 84 c9 74 08 44 88 0c 06 49 8b 45 10 48 RSP: 002b:00007f42da3b3600 EFLAGS: 00000297 RAX: 000000000036d2e6 RBX: 00007f42da3b3660 RCX: 0000000000000001 RDX: 000000000000002b RSI: 00007f42d1f94000 RDI: 00007f42da3b3700 RBP: 0000000000000102 R08: 0000000000000000 R09: 000000000036d2e6 R10: 0000000000000000 R11: 00007f42da3b3670 R12: 00007f42da3b3670 R13: 00007f42da3b3700 R14: 0000000000000001 R15: 0000000000000000 FS: 00007f42da3b4700 GS: 0000000000000000 *** Guest State *** CR0: actual=0x0000000080000031, shadow=0x00000000e0000011, gh_mask=fffffffffffffff7 CR4: actual=0x0000000000002060, shadow=0x0000000000000020, gh_mask=ffffffffffffe871 CR3 = 0x0000000000002000