EXT4-fs (loop0): mounted filesystem without journal. Opts: ,errors=continue INFO: task syz-executor158:8075 blocked for more than 140 seconds. Not tainted 4.19.211-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor158 D26144 8075 8074 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x887/0x2040 kernel/sched/core.c:3517 schedule+0x8d/0x1b0 kernel/sched/core.c:3561 io_schedule+0xb5/0x120 kernel/sched/core.c:5181 bit_wait_io+0x12/0x90 kernel/sched/wait_bit.c:207 __wait_on_bit_lock+0xb5/0x170 kernel/sched/wait_bit.c:89 out_of_line_wait_on_bit_lock+0xd2/0x100 kernel/sched/wait_bit.c:116 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer+0x52/0x60 fs/buffer.c:65 lock_buffer include/linux/buffer_head.h:374 [inline] __sync_dirty_buffer+0x2a6/0x320 fs/buffer.c:3178 __ext4_handle_dirty_metadata+0x234/0x590 fs/ext4/ext4_jbd2.c:300 ext4_convert_inline_data_nolock+0x5c9/0xd10 fs/ext4/inline.c:1246 ext4_convert_inline_data+0x347/0x3a0 fs/ext4/inline.c:2033 ext4_fallocate+0x137/0x2150 fs/ext4/extents.c:4962 vfs_fallocate+0x487/0x9a0 fs/open.c:308 ksys_fallocate fs/open.c:331 [inline] __do_sys_fallocate fs/open.c:339 [inline] __se_sys_fallocate fs/open.c:337 [inline] __x64_sys_fallocate+0xcf/0x140 fs/open.c:337 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f5717681999 Code: Bad RIP value. RSP: 002b:00007fff79375e48 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f5717681999 RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000004 RBP: 00007fff79375e70 R08: 00007fff79375ce0 R09: 0000000000000000 R10: 0000000000000040 R11: 0000000000000246 R12: 00007fff79375e70 R13: 0000000000000000 R14: 431bde82d7b634db R15: 0000000000000000 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 000000000b59733e (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441 1 lock held by in:imklog/7800: 2 locks held by syz-executor158/8075: #0: 000000004cfbb48e (sb_writers#3){.+.+}, at: file_start_write include/linux/fs.h:2779 [inline] #0: 000000004cfbb48e (sb_writers#3){.+.+}, at: vfs_fallocate+0x7c0/0x9a0 fs/open.c:307 #1: 00000000ccb349c5 (&ei->xattr_sem){++++}, at: ext4_write_lock_xattr fs/ext4/xattr.h:141 [inline] #1: 00000000ccb349c5 (&ei->xattr_sem){++++}, at: ext4_convert_inline_data+0x20a/0x3a0 fs/ext4/inline.c:2031 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1570 Comm: khungtaskd Not tainted 4.19.211-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+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: 4684 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:cache_alloc_refill+0x32/0x340 mm/slab.c:2997 Code: 55 41 54 55 53 48 83 ec 20 89 74 24 1c 65 8b 05 b4 7a 6a 7e 4c 8b 37 89 44 24 18 e8 58 20 df 01 89 c0 4c 03 34 c5 00 af cf 89 <41> 8b 76 0c 45 8b 66 08 85 f6 75 0d 41 83 fc 10 b8 10 00 00 00 44 RSP: 0018:ffff8880a100fd80 EFLAGS: 00000082 RAX: 0000000000000000 RBX: 00000000006000c0 RCX: ffffffff83771e8f RDX: 0000000000000000 RSI: ffffffff83771e31 RDI: 0000000000000007 RBP: 00000000006000c0 R08: ffffffff8cd233c0 R09: 0000000000000000 R10: 0000000000000007 R11: 0000000000000000 R12: ffffe8ffffc02d80 R13: ffff88823b843380 R14: ffffe8ffffc02d80 R15: ffff88823b843380 FS: 00007f70e89428c0(0000) GS:ffff8880ba000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f70e5c90000 CR3: 00000000a1ab6000 CR4: 00000000003406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: ____cache_alloc mm/slab.c:3132 [inline] __do_cache_alloc mm/slab.c:3354 [inline] slab_alloc mm/slab.c:3389 [inline] kmem_cache_alloc+0x346/0x370 mm/slab.c:3557 getname_flags+0xce/0x590 fs/namei.c:140 do_sys_open+0x26c/0x520 fs/open.c:1079 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x7f70e7ed1840 Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 RSP: 002b:00007ffcfe4ba148 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 00007ffcfe4ba450 RCX: 00007f70e7ed1840 RDX: 00000000000001a0 RSI: 0000000000080042 RDI: 00005623e9f465e0 RBP: 000000000000000d R08: 00000000000001c0 R09: 00000000ffffffff R10: 0000000000000030 R11: 0000000000000246 R12: 00000000ffffffff R13: 00005623e9f39040 R14: 00007ffcfe4ba410 R15: 00005623e9f466f0 ---------------- Code disassembly (best guess): 0: 55 push %rbp 1: 41 54 push %r12 3: 55 push %rbp 4: 53 push %rbx 5: 48 83 ec 20 sub $0x20,%rsp 9: 89 74 24 1c mov %esi,0x1c(%rsp) d: 65 8b 05 b4 7a 6a 7e mov %gs:0x7e6a7ab4(%rip),%eax # 0x7e6a7ac8 14: 4c 8b 37 mov (%rdi),%r14 17: 89 44 24 18 mov %eax,0x18(%rsp) 1b: e8 58 20 df 01 callq 0x1df2078 20: 89 c0 mov %eax,%eax 22: 4c 03 34 c5 00 af cf add -0x76305100(,%rax,8),%r14 29: 89 * 2a: 41 8b 76 0c mov 0xc(%r14),%esi <-- trapping instruction 2e: 45 8b 66 08 mov 0x8(%r14),%r12d 32: 85 f6 test %esi,%esi 34: 75 0d jne 0x43 36: 41 83 fc 10 cmp $0x10,%r12d 3a: b8 10 00 00 00 mov $0x10,%eax 3f: 44 rex.R