syzbot

INFO: task syz-executor218:8100 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-executor218 D27400  8100   8098 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
 fuse_wait_on_page_writeback fs/fuse/file.c:383 [inline]
 fuse_wait_on_page_writeback.isra.0+0x11b/0x170 fs/fuse/file.c:379
 fuse_launder_page fs/fuse/file.c:2033 [inline]
 fuse_launder_page+0xb6/0xe0 fs/fuse/file.c:2026
 do_launder_page mm/truncate.c:655 [inline]
 invalidate_inode_pages2_range+0x795/0x1110 mm/truncate.c:725
 fuse_finish_open+0x2e2/0x590 fs/fuse/file.c:182
 fuse_open_common+0x254/0x2c0 fs/fuse/file.c:222
 do_dentry_open+0x4aa/0x1160 fs/open.c:796
 do_last fs/namei.c:3421 [inline]
 path_openat+0x793/0x2df0 fs/namei.c:3537
 do_filp_open+0x18c/0x3f0 fs/namei.c:3567
 do_sys_open+0x3b3/0x520 fs/open.c:1085
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fe6697f04c9
Code: Bad RIP value.
RSP: 002b:00007fe6697a12f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007fe6698814c0 RCX: 00007fe6697f04c9
RDX: 0000000000000000 RSI: 0000000000003f00 RDI: 0000000020000080
RBP: 00007fe66984e164 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0030656c69662f2e
R13: 00007fe66984a158 R14: 00007fe66984c160 R15: 00007fe6698814c8

Showing all locks held in the system:
1 lock held by khungtaskd/1571:
 #0: 0000000030baac48 (rcu_read_lock){....}, at: debug_show_all_locks+0x53/0x265 kernel/locking/lockdep.c:4441
1 lock held by in:imklog/7798:
 #0: 00000000d991cd7b (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x26f/0x310 fs/file.c:767
2 locks held by syz-executor218/8100:
 #0: 00000000206601e4 (sb_writers#11){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline]
 #0: 00000000206601e4 (sb_writers#11){.+.+}, at: mnt_want_write+0x3a/0xb0 fs/namespace.c:360
 #1: 000000003ae3db6b (&sb->s_type->i_mutex_key#17){+.+.}, at: inode_lock include/linux/fs.h:748 [inline]
 #1: 000000003ae3db6b (&sb->s_type->i_mutex_key#17){+.+.}, at: fuse_open_common+0x1bc/0x2c0 fs/fuse/file.c:215

=============================================

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 01/12/2023
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: 4696 Comm: systemd-journal Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/12/2023
RIP: 0033:0x7fa832e35369
Code: 8b 04 24 48 89 83 d0 00 00 00 31 c0 e9 75 ff ff ff e8 db 7b f1 ff 90 66 2e 0f 1f 84 00 00 00 00 00 41 57 41 56 41 55 41 54 55 <53> 48 83 ec 18 64 48 8b 04 25 28 00 00 00 48 89 44 24 08 31 c0 48
RSP: 002b:00007ffd6fff5580 EFLAGS: 00000202
RAX: 00000000000000ea RBX: 000000000000063a RCX: 00007ffd6fff55d8
RDX: 0000000000160a80 RSI: 0000000000000006 RDI: 000055f8c1142e80
RBP: 0000000000160a80 R08: 000000000013e650 R09: 000055f8c1143120
R10: 00040221eecfe8c0 R11: 00007fa830518618 R12: 000055f8c1142e80
R13: 00007ffd6fff55d8 R14: 00007ffd6fff5670 R15: 00007fa830403ee8
FS:  00007fa8331478c0 GS:  0000000000000000