bisecting fixing commit since 64b4fc45bea6f4faa843d2f97ff51665280efee1 building syzkaller on be2c130d4c0c511da96ce278486cf0564aeadcea testing commit 64b4fc45bea6f4faa843d2f97ff51665280efee1 compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: a3fe91368b5fd3fe51bac40c148f21c0653a715c54c44e14f6b308a6932bebe8 all runs: crashed: INFO: task hung in __sync_dirty_buffer testing current HEAD 180eca540ae06246d594bdd8d8213426a259cc8c testing commit 180eca540ae06246d594bdd8d8213426a259cc8c compiler: gcc (GCC) 10.2.1 20210217, GNU ld (GNU Binutils for Debian) 2.35.2 kernel signature: fd68ceed31180763fb255efac6be245cce4299c9fc14ea65f9cbe77764544aff all runs: crashed: INFO: task hung in __sync_dirty_buffer revisions tested: 2, total time: 25m4.879046105s (build: 12m49.242051637s, test: 11m44.627540471s) the crash still happens on HEAD commit msg: Merge tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi crash: INFO: task hung in __sync_dirty_buffer INFO: task syz-executor.5:9055 blocked for more than 143 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:26072 pid: 9055 ppid: 7032 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x90d/0x26c0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 io_schedule+0xba/0x130 kernel/sched/core.c:8389 bit_wait_io+0x12/0xd0 kernel/sched/wait_bit.c:209 __wait_on_bit_lock+0x121/0x1a0 kernel/sched/wait_bit.c:90 out_of_line_wait_on_bit_lock+0xd5/0x110 kernel/sched/wait_bit.c:117 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer fs/buffer.c:69 [inline] lock_buffer include/linux/buffer_head.h:368 [inline] __sync_dirty_buffer+0x28f/0x310 fs/buffer.c:3142 __ext4_handle_dirty_metadata+0x1c6/0x680 fs/ext4/ext4_jbd2.c:380 ext4_convert_inline_data_nolock+0x5cb/0xfe0 fs/ext4/inline.c:1252 ext4_convert_inline_data+0x297/0x3d0 fs/ext4/inline.c:2024 ext4_fallocate+0x150/0x3310 fs/ext4/extents.c:4672 vfs_fallocate+0x2a5/0xb90 fs/open.c:307 ksys_fallocate fs/open.c:330 [inline] __do_sys_fallocate fs/open.c:338 [inline] __se_sys_fallocate fs/open.c:336 [inline] __x64_sys_fallocate+0xb0/0x100 fs/open.c:336 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007f6148107188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000100000001 RDI: 0000000000000006 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 000000002811fdff R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffd6425f28f R14: 00007f6148107300 R15: 0000000000022000 INFO: task syz-executor.5:9099 blocked for more than 143 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.5 state:D stack:26208 pid: 9099 ppid: 7032 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x90d/0x26c0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 io_schedule+0xba/0x130 kernel/sched/core.c:8389 bit_wait_io+0x12/0xd0 kernel/sched/wait_bit.c:209 __wait_on_bit_lock+0x121/0x1a0 kernel/sched/wait_bit.c:90 out_of_line_wait_on_bit_lock+0xd5/0x110 kernel/sched/wait_bit.c:117 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer fs/buffer.c:69 [inline] lock_buffer include/linux/buffer_head.h:368 [inline] write_dirty_buffer+0x113/0x130 fs/buffer.c:3121 fsync_buffers_list fs/buffer.c:705 [inline] sync_mapping_buffers+0x300/0x980 fs/buffer.c:548 ext4_fsync_nojournal fs/ext4/fsync.c:86 [inline] ext4_sync_file+0x74c/0xc90 fs/ext4/fsync.c:170 generic_write_sync include/linux/fs.h:2955 [inline] ext4_buffered_write_iter+0x2d3/0x480 fs/ext4/file.c:277 ext4_file_write_iter+0x383/0x1160 fs/ext4/file.c:680 call_write_iter include/linux/fs.h:2163 [inline] new_sync_write+0x360/0x600 fs/read_write.c:507 vfs_write+0x60b/0x900 fs/read_write.c:594 ksys_write+0xf4/0x1d0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007f61480e6188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665f9 RDX: 0000000000000082 RSI: 00000000200004c0 RDI: 0000000000000004 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffd6425f28f R14: 00007f61480e6300 R15: 0000000000022000 INFO: task syz-executor.0:9134 blocked for more than 144 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.0 state:D stack:26240 pid: 9134 ppid: 7033 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x90d/0x26c0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 io_schedule+0xba/0x130 kernel/sched/core.c:8389 bit_wait_io+0x12/0xd0 kernel/sched/wait_bit.c:209 __wait_on_bit_lock+0x121/0x1a0 kernel/sched/wait_bit.c:90 out_of_line_wait_on_bit_lock+0xd5/0x110 kernel/sched/wait_bit.c:117 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer fs/buffer.c:69 [inline] lock_buffer include/linux/buffer_head.h:368 [inline] __sync_dirty_buffer+0x28f/0x310 fs/buffer.c:3142 __ext4_handle_dirty_metadata+0x1c6/0x680 fs/ext4/ext4_jbd2.c:380 ext4_convert_inline_data_nolock+0x5cb/0xfe0 fs/ext4/inline.c:1252 ext4_convert_inline_data+0x297/0x3d0 fs/ext4/inline.c:2024 ext4_fallocate+0x150/0x3310 fs/ext4/extents.c:4672 vfs_fallocate+0x2a5/0xb90 fs/open.c:307 ksys_fallocate fs/open.c:330 [inline] __do_sys_fallocate fs/open.c:338 [inline] __se_sys_fallocate fs/open.c:336 [inline] __x64_sys_fallocate+0xb0/0x100 fs/open.c:336 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007f4207c0d188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000100000001 RDI: 0000000000000006 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 000000002811fdff R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffd7bfd9f2f R14: 00007f4207c0d300 R15: 0000000000022000 INFO: task syz-executor.4:9181 blocked for more than 144 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:26240 pid: 9181 ppid: 7030 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x90d/0x26c0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 io_schedule+0xba/0x130 kernel/sched/core.c:8389 bit_wait_io+0x12/0xd0 kernel/sched/wait_bit.c:209 __wait_on_bit_lock+0x121/0x1a0 kernel/sched/wait_bit.c:90 out_of_line_wait_on_bit_lock+0xd5/0x110 kernel/sched/wait_bit.c:117 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer fs/buffer.c:69 [inline] lock_buffer include/linux/buffer_head.h:368 [inline] __sync_dirty_buffer+0x28f/0x310 fs/buffer.c:3142 __ext4_handle_dirty_metadata+0x1c6/0x680 fs/ext4/ext4_jbd2.c:380 ext4_convert_inline_data_nolock+0x5cb/0xfe0 fs/ext4/inline.c:1252 ext4_convert_inline_data+0x297/0x3d0 fs/ext4/inline.c:2024 ext4_fallocate+0x150/0x3310 fs/ext4/extents.c:4672 vfs_fallocate+0x2a5/0xb90 fs/open.c:307 ksys_fallocate fs/open.c:330 [inline] __do_sys_fallocate fs/open.c:338 [inline] __se_sys_fallocate fs/open.c:336 [inline] __x64_sys_fallocate+0xb0/0x100 fs/open.c:336 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007f5035a6e188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000100000001 RDI: 0000000000000006 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 000000002811fdff R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffcd4e36acf R14: 00007f5035a6e300 R15: 0000000000022000 INFO: task syz-executor.4:9194 blocked for more than 145 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.4 state:D stack:26856 pid: 9194 ppid: 7030 flags:0x00004004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x90d/0x26c0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 io_schedule+0xba/0x130 kernel/sched/core.c:8389 bit_wait_io+0x12/0xd0 kernel/sched/wait_bit.c:209 __wait_on_bit_lock+0x121/0x1a0 kernel/sched/wait_bit.c:90 out_of_line_wait_on_bit_lock+0xd5/0x110 kernel/sched/wait_bit.c:117 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer fs/buffer.c:69 [inline] lock_buffer include/linux/buffer_head.h:368 [inline] write_dirty_buffer+0x113/0x130 fs/buffer.c:3121 fsync_buffers_list fs/buffer.c:705 [inline] sync_mapping_buffers+0x300/0x980 fs/buffer.c:548 ext4_fsync_nojournal fs/ext4/fsync.c:86 [inline] ext4_sync_file+0x74c/0xc90 fs/ext4/fsync.c:170 generic_write_sync include/linux/fs.h:2955 [inline] ext4_buffered_write_iter+0x2d3/0x480 fs/ext4/file.c:277 ext4_file_write_iter+0x383/0x1160 fs/ext4/file.c:680 call_write_iter include/linux/fs.h:2163 [inline] new_sync_write+0x360/0x600 fs/read_write.c:507 vfs_write+0x60b/0x900 fs/read_write.c:594 ksys_write+0xf4/0x1d0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007f5035a4d188 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665f9 RDX: 0000000000000082 RSI: 00000000200004c0 RDI: 0000000000000004 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056c038 R13: 00007ffcd4e36acf R14: 00007f5035a4d300 R15: 0000000000022000 INFO: task syz-executor.1:9206 blocked for more than 145 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.1 state:D stack:26240 pid: 9206 ppid: 7028 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x90d/0x26c0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 io_schedule+0xba/0x130 kernel/sched/core.c:8389 bit_wait_io+0x12/0xd0 kernel/sched/wait_bit.c:209 __wait_on_bit_lock+0x121/0x1a0 kernel/sched/wait_bit.c:90 out_of_line_wait_on_bit_lock+0xd5/0x110 kernel/sched/wait_bit.c:117 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer fs/buffer.c:69 [inline] lock_buffer include/linux/buffer_head.h:368 [inline] __sync_dirty_buffer+0x28f/0x310 fs/buffer.c:3142 __ext4_handle_dirty_metadata+0x1c6/0x680 fs/ext4/ext4_jbd2.c:380 ext4_convert_inline_data_nolock+0x5cb/0xfe0 fs/ext4/inline.c:1252 ext4_convert_inline_data+0x297/0x3d0 fs/ext4/inline.c:2024 ext4_fallocate+0x150/0x3310 fs/ext4/extents.c:4672 vfs_fallocate+0x2a5/0xb90 fs/open.c:307 ksys_fallocate fs/open.c:330 [inline] __do_sys_fallocate fs/open.c:338 [inline] __se_sys_fallocate fs/open.c:336 [inline] __x64_sys_fallocate+0xb0/0x100 fs/open.c:336 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007f09ae742188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000100000001 RDI: 0000000000000006 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 000000002811fdff R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffc20c2447f R14: 00007f09ae742300 R15: 0000000000022000 INFO: task syz-executor.2:9234 blocked for more than 145 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.2 state:D stack:26240 pid: 9234 ppid: 7026 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x90d/0x26c0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 io_schedule+0xba/0x130 kernel/sched/core.c:8389 bit_wait_io+0x12/0xd0 kernel/sched/wait_bit.c:209 __wait_on_bit_lock+0x121/0x1a0 kernel/sched/wait_bit.c:90 out_of_line_wait_on_bit_lock+0xd5/0x110 kernel/sched/wait_bit.c:117 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer fs/buffer.c:69 [inline] lock_buffer include/linux/buffer_head.h:368 [inline] __sync_dirty_buffer+0x28f/0x310 fs/buffer.c:3142 __ext4_handle_dirty_metadata+0x1c6/0x680 fs/ext4/ext4_jbd2.c:380 ext4_convert_inline_data_nolock+0x5cb/0xfe0 fs/ext4/inline.c:1252 ext4_convert_inline_data+0x297/0x3d0 fs/ext4/inline.c:2024 ext4_fallocate+0x150/0x3310 fs/ext4/extents.c:4672 vfs_fallocate+0x2a5/0xb90 fs/open.c:307 ksys_fallocate fs/open.c:330 [inline] __do_sys_fallocate fs/open.c:338 [inline] __se_sys_fallocate fs/open.c:336 [inline] __x64_sys_fallocate+0xb0/0x100 fs/open.c:336 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007f8ee3bc9188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000100000001 RDI: 0000000000000006 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 000000002811fdff R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffd7ee6b72f R14: 00007f8ee3bc9300 R15: 0000000000022000 INFO: task syz-executor.3:9246 blocked for more than 145 seconds. Not tainted 5.15.0-rc7-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz-executor.3 state:D stack:26240 pid: 9246 ppid: 7029 flags:0x00000004 Call Trace: context_switch kernel/sched/core.c:4940 [inline] __schedule+0x90d/0x26c0 kernel/sched/core.c:6287 schedule+0xd3/0x270 kernel/sched/core.c:6366 io_schedule+0xba/0x130 kernel/sched/core.c:8389 bit_wait_io+0x12/0xd0 kernel/sched/wait_bit.c:209 __wait_on_bit_lock+0x121/0x1a0 kernel/sched/wait_bit.c:90 out_of_line_wait_on_bit_lock+0xd5/0x110 kernel/sched/wait_bit.c:117 wait_on_bit_lock_io include/linux/wait_bit.h:208 [inline] __lock_buffer fs/buffer.c:69 [inline] lock_buffer include/linux/buffer_head.h:368 [inline] __sync_dirty_buffer+0x28f/0x310 fs/buffer.c:3142 __ext4_handle_dirty_metadata+0x1c6/0x680 fs/ext4/ext4_jbd2.c:380 ext4_convert_inline_data_nolock+0x5cb/0xfe0 fs/ext4/inline.c:1252 ext4_convert_inline_data+0x297/0x3d0 fs/ext4/inline.c:2024 ext4_fallocate+0x150/0x3310 fs/ext4/extents.c:4672 vfs_fallocate+0x2a5/0xb90 fs/open.c:307 ksys_fallocate fs/open.c:330 [inline] __do_sys_fallocate fs/open.c:338 [inline] __se_sys_fallocate fs/open.c:336 [inline] __x64_sys_fallocate+0xb0/0x100 fs/open.c:336 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x4665f9 RSP: 002b:00007ff04c963188 EFLAGS: 00000246 ORIG_RAX: 000000000000011d RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665f9 RDX: 0000000000000000 RSI: 0000000100000001 RDI: 0000000000000006 RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000 R10: 000000002811fdff R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffcd974299f R14: 00007ff04c963300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8ab76880 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x53/0x260 kernel/locking/lockdep.c:6446 1 lock held by in:imklog/6201: #0: ffff8880141a8d70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x9c/0xb0 fs/file.c:990 2 locks held by syz-executor.5/9055: #0: ffff88807b570460 (sb_writers#5){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:330 [inline] #0: ffff88807b570460 (sb_writers#5){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:338 [inline] #0: ffff88807b570460 (sb_writers#5){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:336 [inline] #0: ffff88807b570460 (sb_writers#5){.+.+}-{0:0}, at: __x64_sys_fallocate+0xb0/0x100 fs/open.c:336 #1: ffff88806a4b32a0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:142 [inline] #1: ffff88806a4b32a0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x1ca/0x3d0 fs/ext4/inline.c:2022 2 locks held by syz-executor.5/9099: #0: ffff88801c3aad70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x9c/0xb0 fs/file.c:990 #1: ffff88807b570460 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0xf4/0x1d0 fs/read_write.c:647 2 locks held by syz-executor.0/9134: #0: ffff888014de0460 (sb_writers#5){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:330 [inline] #0: ffff888014de0460 (sb_writers#5){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:338 [inline] #0: ffff888014de0460 (sb_writers#5){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:336 [inline] #0: ffff888014de0460 (sb_writers#5){.+.+}-{0:0}, at: __x64_sys_fallocate+0xb0/0x100 fs/open.c:336 #1: ffff88806f363c98 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:142 [inline] #1: ffff88806f363c98 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x1ca/0x3d0 fs/ext4/inline.c:2022 2 locks held by syz-executor.4/9181: #0: ffff888060d7e460 (sb_writers#5){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:330 [inline] #0: ffff888060d7e460 (sb_writers#5){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:338 [inline] #0: ffff888060d7e460 (sb_writers#5){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:336 [inline] #0: ffff888060d7e460 (sb_writers#5){.+.+}-{0:0}, at: __x64_sys_fallocate+0xb0/0x100 fs/open.c:336 #1: ffff8880616e32a0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:142 [inline] #1: ffff8880616e32a0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x1ca/0x3d0 fs/ext4/inline.c:2022 2 locks held by syz-executor.4/9194: #0: ffff88807a35ed70 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x9c/0xb0 fs/file.c:990 #1: ffff888060d7e460 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0xf4/0x1d0 fs/read_write.c:647 2 locks held by syz-executor.1/9206: #0: ffff888014d88460 (sb_writers#5){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:330 [inline] #0: ffff888014d88460 (sb_writers#5){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:338 [inline] #0: ffff888014d88460 (sb_writers#5){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:336 [inline] #0: ffff888014d88460 (sb_writers#5){.+.+}-{0:0}, at: __x64_sys_fallocate+0xb0/0x100 fs/open.c:336 #1: ffff8880616e9eb0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:142 [inline] #1: ffff8880616e9eb0 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x1ca/0x3d0 fs/ext4/inline.c:2022 2 locks held by syz-executor.1/9256: #0: ffff8880747f45f0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x9c/0xb0 fs/file.c:990 #1: ffff888014d88460 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0xf4/0x1d0 fs/read_write.c:647 2 locks held by syz-executor.2/9234: #0: ffff888077b56460 (sb_writers#5){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:330 [inline] #0: ffff888077b56460 (sb_writers#5){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:338 [inline] #0: ffff888077b56460 (sb_writers#5){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:336 [inline] #0: ffff888077b56460 (sb_writers#5){.+.+}-{0:0}, at: __x64_sys_fallocate+0xb0/0x100 fs/open.c:336 #1: ffff88806a4a4690 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:142 [inline] #1: ffff88806a4a4690 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x1ca/0x3d0 fs/ext4/inline.c:2022 2 locks held by syz-executor.2/9260: #0: ffff88807ef16ff0 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x9c/0xb0 fs/file.c:990 #1: ffff888077b56460 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0xf4/0x1d0 fs/read_write.c:647 2 locks held by syz-executor.3/9246: #0: ffff888141fd6460 (sb_writers#5){.+.+}-{0:0}, at: ksys_fallocate fs/open.c:330 [inline] #0: ffff888141fd6460 (sb_writers#5){.+.+}-{0:0}, at: __do_sys_fallocate fs/open.c:338 [inline] #0: ffff888141fd6460 (sb_writers#5){.+.+}-{0:0}, at: __se_sys_fallocate fs/open.c:336 [inline] #0: ffff888141fd6460 (sb_writers#5){.+.+}-{0:0}, at: __x64_sys_fallocate+0xb0/0x100 fs/open.c:336 #1: ffff88806a4a6e70 (&ei->xattr_sem){++++}-{3:3}, at: ext4_write_lock_xattr fs/ext4/xattr.h:142 [inline] #1: ffff88806a4a6e70 (&ei->xattr_sem){++++}-{3:3}, at: ext4_convert_inline_data+0x1ca/0x3d0 fs/ext4/inline.c:2022 2 locks held by syz-executor.3/9264: #0: ffff88807ef17270 (&f->f_pos_lock){+.+.}-{3:3}, at: __fdget_pos+0x9c/0xb0 fs/file.c:990 #1: ffff888141fd6460 (sb_writers#5){.+.+}-{0:0}, at: ksys_write+0xf4/0x1d0 fs/read_write.c:647 5 locks held by kworker/u4:8/9269: ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 27 Comm: khungtaskd Not tainted 5.15.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x57/0x7d lib/dump_stack.c:106 nmi_cpu_backtrace.cold+0x30/0xc0 lib/nmi_backtrace.c:105 nmi_trigger_cpumask_backtrace+0x11a/0x160 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:210 [inline] watchdog+0x88c/0xbf0 kernel/hung_task.c:295 kthread+0x38b/0x460 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 9269 Comm: kworker/u4:8 Not tainted 5.15.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: writeback wb_workfn (flush-7:2) RIP: 0010:__lock_release kernel/locking/lockdep.c:5332 [inline] RIP: 0010:lock_release+0x2d3/0x720 kernel/locking/lockdep.c:5645 Code: 24 50 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 0f b6 04 02 84 c0 74 08 3c 03 0f 8e 7f 03 00 00 48 89 da 45 89 a7 f0 09 00 00 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 aa 03 RSP: 0018:ffffc9000cc9f270 EFLAGS: 00000046 RAX: 0000000000000000 RBX: ffff88807cf926b0 RCX: ffffc9000cc9f2c0 RDX: ffff88807cf926b0 RSI: 0000000000000000 RDI: ffff88807cf926d2 RBP: 1ffff92001993e50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000079 R12: 0000000000000003 R13: 0000000000000004 R14: ffff88807cf92630 R15: ffff88807cf91c40 FS: 0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f1e754e4000 CR3: 00000000728e2000 CR4: 0000000000350ef0 Call Trace: rcu_lock_release include/linux/rcupdate.h:272 [inline] rcu_read_unlock include/linux/rcupdate.h:720 [inline] find_get_pages_range_tag+0x31c/0x6d0 mm/filemap.c:2298 pagevec_lookup_range_tag+0x23/0x60 mm/swap.c:1114 write_cache_pages+0x1ec/0xd40 mm/page-writeback.c:2212 generic_writepages mm/page-writeback.c:2346 [inline] generic_writepages+0xd7/0x140 mm/page-writeback.c:2335 do_writepages+0x16c/0x6e0 mm/page-writeback.c:2364 __writeback_single_inode+0xd6/0xaf0 fs/fs-writeback.c:1616 writeback_sb_inodes+0x466/0xc50 fs/fs-writeback.c:1881 __writeback_inodes_wb+0xb2/0x200 fs/fs-writeback.c:1950 wb_writeback+0x5a6/0x8b0 fs/fs-writeback.c:2055 wb_check_old_data_flush fs/fs-writeback.c:2155 [inline] wb_do_writeback fs/fs-writeback.c:2208 [inline] wb_workfn+0x6de/0xf30 fs/fs-writeback.c:2237 process_one_work+0x87f/0x1450 kernel/workqueue.c:2297 worker_thread+0x598/0x1040 kernel/workqueue.c:2444 kthread+0x38b/0x460 kernel/kthread.c:319 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 ---------------- Code disassembly (best guess): 0: 24 50 and $0x50,%al 2: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax 9: fc ff df c: 48 c1 ea 03 shr $0x3,%rdx 10: 0f b6 04 02 movzbl (%rdx,%rax,1),%eax 14: 84 c0 test %al,%al 16: 74 08 je 0x20 18: 3c 03 cmp $0x3,%al 1a: 0f 8e 7f 03 00 00 jle 0x39f 20: 48 89 da mov %rbx,%rdx 23: 45 89 a7 f0 09 00 00 mov %r12d,0x9f0(%r15) * 2a: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax <-- trapping instruction 31: fc ff df 34: 48 c1 ea 03 shr $0x3,%rdx 38: 80 3c 02 00 cmpb $0x0,(%rdx,%rax,1) 3c: 0f .byte 0xf 3d: 85 .byte 0x85 3e: aa stos %al,%es:(%rdi) 3f: 03 .byte 0x3