INFO: task kworker/u4:0:7 blocked for more than 140 seconds. Not tainted 4.18.0-rc6+ #168 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:0 D15496 7 2 0x80000000 Workqueue: writeback wb_workfn (flush-8:0) Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 wait_transaction_locked+0x24d/0x310 fs/jbd2/transaction.c:159 add_transaction_credits+0x550/0xe90 fs/jbd2/transaction.c:187 start_this_handle+0x427/0x1260 fs/jbd2/transaction.c:357 jbd2__journal_start+0x3cb/0xa80 fs/jbd2/transaction.c:439 __ext4_journal_start_sb+0x182/0x600 fs/ext4/ext4_jbd2.c:81 __ext4_journal_start fs/ext4/ext4_jbd2.h:311 [inline] ext4_writepages+0x180a/0x4080 fs/ext4/inode.c:2836 do_writepages+0x9a/0x1a0 mm/page-writeback.c:2341 __writeback_single_inode+0x1ec/0x15e0 fs/fs-writeback.c:1323 writeback_sb_inodes+0x71f/0x11d0 fs/fs-writeback.c:1587 __writeback_inodes_wb+0x1b8/0x340 fs/fs-writeback.c:1656 wb_writeback+0x9f1/0xf80 fs/fs-writeback.c:1765 wb_check_old_data_flush fs/fs-writeback.c:1867 [inline] wb_do_writeback fs/fs-writeback.c:1920 [inline] wb_workfn+0xfb7/0x1760 fs/fs-writeback.c:1949 process_one_work+0xc73/0x1ba0 kernel/workqueue.c:2153 worker_thread+0x189/0x13c0 kernel/workqueue.c:2296 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 INFO: task khugepaged:779 blocked for more than 140 seconds. Not tainted 4.18.0-rc6+ #168 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. khugepaged D20424 779 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 __rwsem_down_write_failed_common+0x95d/0x1630 kernel/locking/rwsem-xadd.c:566 rwsem_down_write_failed+0xe/0x10 kernel/locking/rwsem-xadd.c:595 call_rwsem_down_write_failed+0x17/0x30 arch/x86/lib/rwsem.S:117 __down_write arch/x86/include/asm/rwsem.h:142 [inline] down_write+0xaa/0x130 kernel/locking/rwsem.c:72 collapse_huge_page+0x2b9/0x2140 mm/khugepaged.c:1006 khugepaged_scan_pmd mm/khugepaged.c:1215 [inline] khugepaged_scan_mm_slot+0x20a1/0x3370 mm/khugepaged.c:1734 khugepaged_do_scan mm/khugepaged.c:1815 [inline] khugepaged+0x9aa/0xce0 mm/khugepaged.c:1860 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 INFO: task jbd2/sda1-8:2169 blocked for more than 140 seconds. Not tainted 4.18.0-rc6+ #168 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. jbd2/sda1-8 D17368 2169 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 jbd2_journal_commit_transaction+0xccf/0x8c54 fs/jbd2/commit.c:434 kjournald2+0x274/0xb50 fs/jbd2/journal.c:229 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 INFO: task syz-fuzzer:4445 blocked for more than 140 seconds. Not tainted 4.18.0-rc6+ #168 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-fuzzer D18968 4445 4428 0x00000000 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 wait_transaction_locked+0x24d/0x310 fs/jbd2/transaction.c:159 add_transaction_credits+0x550/0xe90 fs/jbd2/transaction.c:187 start_this_handle+0x427/0x1260 fs/jbd2/transaction.c:357 jbd2__journal_start+0x3cb/0xa80 fs/jbd2/transaction.c:439 __ext4_journal_start_sb+0x182/0x600 fs/ext4/ext4_jbd2.c:81 __ext4_journal_start fs/ext4/ext4_jbd2.h:311 [inline] ext4_dirty_inode+0x62/0xc0 fs/ext4/inode.c:5977 __mark_inode_dirty+0x825/0x1550 fs/fs-writeback.c:2129 generic_update_time+0x26a/0x450 fs/inode.c:1643 update_time fs/inode.c:1659 [inline] file_update_time+0x390/0x640 fs/inode.c:1870 ext4_page_mkwrite+0x1fe/0x1430 fs/ext4/inode.c:6125 do_page_mkwrite+0x14e/0x520 mm/memory.c:2380 wp_page_shared mm/memory.c:2676 [inline] do_wp_page+0xf78/0x19b0 mm/memory.c:2776 handle_pte_fault mm/memory.c:3988 [inline] __handle_mm_fault+0x2a84/0x4460 mm/memory.c:4096 handle_mm_fault+0x53e/0xc80 mm/memory.c:4133 __do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1396 do_page_fault+0xf6/0x8c0 arch/x86/mm/fault.c:1471 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1160 RIP: 0033:0x70b7b1 Code: 48 89 6c 24 10 48 8d 6c 24 10 48 8b 44 24 20 48 8b 48 08 48 8b 50 10 48 8d 58 08 48 83 fa 08 0f 8c 1e 01 00 00 48 8b 54 24 28 <88> 11 48 8b 48 08 48 8b 70 10 48 83 fe 01 0f 86 44 01 00 00 48 89 RSP: 002b:000000c42c5a1048 EFLAGS: 00010212 RAX: 000000c42c5a1880 RBX: 000000c42c5a1888 RCX: 00007f463e63b000 RDX: 0000000000000002 RSI: 0000000000000000 RDI: 000000c42c5a1148 RBP: 000000c42c5a1058 R08: 0000000000000000 R09: 0000000000000000 R10: 000000000096203e R11: 0000000000000004 R12: 0000000000000000 R13: 0000000000000020 R14: 0000000000000013 R15: 000000c42c5a1a08 INFO: task syz-fuzzer:4446 blocked for more than 140 seconds. Not tainted 4.18.0-rc6+ #168 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-fuzzer D19592 4446 4428 0x00000000 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 __rwsem_down_read_failed_common kernel/locking/rwsem-xadd.c:269 [inline] rwsem_down_read_failed+0x362/0x600 kernel/locking/rwsem-xadd.c:286 call_rwsem_down_read_failed+0x18/0x30 arch/x86/lib/rwsem.S:94 __down_read arch/x86/include/asm/rwsem.h:83 [inline] down_read+0xc3/0x1d0 kernel/locking/rwsem.c:26 __do_page_fault+0xae1/0xe50 arch/x86/mm/fault.c:1332 do_page_fault+0xf6/0x8c0 arch/x86/mm/fault.c:1471 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1160 RIP: 0033:0x42283f Code: 18 48 03 0e 48 8b 73 20 48 c7 00 00 00 00 00 48 c7 40 08 00 00 00 00 48 c7 40 10 00 00 00 00 48 89 48 18 48 29 d6 48 89 70 20 40 60 00 00 00 00 48 c7 40 68 00 00 00 00 c6 40 64 00 48 c7 40 RSP: 002b:000000c4203cbdc0 EFLAGS: 00010206 RAX: 00007f4636a11fc0 RBX: 00007f4636a11f28 RCX: 000000c431150000 RDX: 0000000000000002 RSI: 0000000000000128 RDI: 0000000000000000 RBP: 000000c4203cbdf0 R08: 000000c420000180 R09: 0000000000000075 R10: 0000000000bfd400 R11: 000000005eaf9345 R12: 00000000e940fbb7 R13: 000000009113e0e0 R14: 0000000076bf68b7 R15: 0000000076cc115b INFO: task syz-executor0:4458 blocked for more than 140 seconds. Not tainted 4.18.0-rc6+ #168 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor0 D21208 4458 4449 0x00000000 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 wait_transaction_locked+0x24d/0x310 fs/jbd2/transaction.c:159 add_transaction_credits+0x550/0xe90 fs/jbd2/transaction.c:187 start_this_handle+0x427/0x1260 fs/jbd2/transaction.c:357 jbd2__journal_start+0x3cb/0xa80 fs/jbd2/transaction.c:439 __ext4_journal_start_sb+0x182/0x600 fs/ext4/ext4_jbd2.c:81 __ext4_journal_start fs/ext4/ext4_jbd2.h:311 [inline] ext4_dirty_inode+0x62/0xc0 fs/ext4/inode.c:5977 __mark_inode_dirty+0x825/0x1550 fs/fs-writeback.c:2129 generic_update_time+0x26a/0x450 fs/inode.c:1643 update_time fs/inode.c:1659 [inline] touch_atime+0x29e/0x320 fs/inode.c:1731 file_accessed include/linux/fs.h:2082 [inline] iterate_dir+0x394/0x5d0 fs/readdir.c:56 __do_sys_getdents fs/readdir.c:231 [inline] __se_sys_getdents fs/readdir.c:212 [inline] __x64_sys_getdents+0x29f/0x510 fs/readdir.c:212 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x454eeb Code: 24 68 48 8d 77 01 48 8b 44 24 40 48 8b 8c 24 b8 00 00 00 48 8b 54 24 30 48 8b 9c 24 90 00 00 00 48 39 c6 7d 52 48 8b 3c f1 48 <39> d6 0f 83 5e 0b 00 00 48 89 74 24 68 48 8b 04 f3 48 89 44 24 08 RSP: 002b:00007fff54d8cb30 EFLAGS: 00000206 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 0000000001bed970 RCX: 0000000000454eeb RDX: 0000000000008000 RSI: 0000000001bed970 RDI: 0000000000000013 RBP: 0000000001bed970 R08: 0000000000000001 R09: 0000000001bec940 R10: 0000000000000000 R11: 0000000000000206 R12: ffffffffffffffd4 R13: 0000000000000016 R14: 0000000000000075 R15: badc0ffeebadface INFO: task syz-executor3:4459 blocked for more than 140 seconds. Not tainted 4.18.0-rc6+ #168 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor3 D18280 4459 4451 0x00000000 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 jbd2_log_wait_commit+0x329/0x4b0 fs/jbd2/journal.c:726 jbd2_journal_stop+0xb54/0x15c0 fs/jbd2/transaction.c:1777 __ext4_journal_stop+0xde/0x1f0 fs/ext4/ext4_jbd2.c:103 ext4_mkdir+0xa2c/0xe60 fs/ext4/namei.c:2659 vfs_mkdir+0x42e/0x6b0 fs/namei.c:3827 do_mkdirat+0x27b/0x310 fs/namei.c:3850 __do_sys_mkdir fs/namei.c:3866 [inline] __se_sys_mkdir fs/namei.c:3864 [inline] __x64_sys_mkdir+0x5c/0x80 fs/namei.c:3864 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x455e47 Code: 8d 6c 24 50 48 8b 44 24 60 c6 00 00 48 8b 4c 24 68 48 89 ca 48 89 50 08 48 8b 59 20 48 01 da 31 db 31 f6 31 ff eb 02 ff c3 44 <0f> b7 41 38 66 44 39 c3 73 50 44 0f b7 c3 4d 6b c0 38 4e 8d 0c 02 RSP: 002b:00007fffc53f5f18 EFLAGS: 00000206 ORIG_RAX: 0000000000000053 RAX: ffffffffffffffda RBX: 000000000002efeb RCX: 0000000000455e47 RDX: 00007fffc53f5f35 RSI: 00000000000001ff RDI: 00007fffc53f5f30 RBP: 0000000000000008 R08: 0000000000000000 R09: 0000000000000005 R10: 0000000000000064 R11: 0000000000000206 R12: 0000000000000270 R13: 000000000002efb3 R14: 0000000000000066 R15: badc0ffeebadface INFO: task syz-executor7:4460 blocked for more than 140 seconds. Not tainted 4.18.0-rc6+ #168 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor7 D21592 4460 4454 0x00000000 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 wait_transaction_locked+0x24d/0x310 fs/jbd2/transaction.c:159 add_transaction_credits+0x550/0xe90 fs/jbd2/transaction.c:187 start_this_handle+0x427/0x1260 fs/jbd2/transaction.c:357 jbd2__journal_start+0x3cb/0xa80 fs/jbd2/transaction.c:439 __ext4_journal_start_sb+0x182/0x600 fs/ext4/ext4_jbd2.c:81 __ext4_journal_start fs/ext4/ext4_jbd2.h:311 [inline] ext4_dirty_inode+0x62/0xc0 fs/ext4/inode.c:5977 __mark_inode_dirty+0x825/0x1550 fs/fs-writeback.c:2129 generic_update_time+0x26a/0x450 fs/inode.c:1643 update_time fs/inode.c:1659 [inline] touch_atime+0x29e/0x320 fs/inode.c:1731 file_accessed include/linux/fs.h:2082 [inline] iterate_dir+0x394/0x5d0 fs/readdir.c:56 __do_sys_getdents fs/readdir.c:231 [inline] __se_sys_getdents fs/readdir.c:212 [inline] __x64_sys_getdents+0x29f/0x510 fs/readdir.c:212 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x454eeb Code: 24 68 48 8d 77 01 48 8b 44 24 40 48 8b 8c 24 b8 00 00 00 48 8b 54 24 30 48 8b 9c 24 90 00 00 00 48 39 c6 7d 52 48 8b 3c f1 48 <39> d6 0f 83 5e 0b 00 00 48 89 74 24 68 48 8b 04 f3 48 89 44 24 08 RSP: 002b:00007ffe86e74fc0 EFLAGS: 00000206 ORIG_RAX: 000000000000004e RAX: ffffffffffffffda RBX: 00000000012d8970 RCX: 0000000000454eeb RDX: 0000000000008000 RSI: 00000000012d8970 RDI: 0000000000000013 RBP: 00000000012d8970 R08: 0000000000000001 R09: 00000000012d7940 R10: 0000000000000000 R11: 0000000000000206 R12: ffffffffffffffd4 R13: 0000000000000016 R14: 0000000000000065 R15: badc0ffeebadface INFO: task syz-executor4:10561 blocked for more than 140 seconds. Not tainted 4.18.0-rc6+ #168 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor4 D23640 10561 4461 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 wait_transaction_locked+0x24d/0x310 fs/jbd2/transaction.c:159 add_transaction_credits+0x550/0xe90 fs/jbd2/transaction.c:187 start_this_handle+0x427/0x1260 fs/jbd2/transaction.c:357 jbd2__journal_start+0x3cb/0xa80 fs/jbd2/transaction.c:439 __ext4_journal_start_sb+0x182/0x600 fs/ext4/ext4_jbd2.c:81 __ext4_journal_start fs/ext4/ext4_jbd2.h:311 [inline] ext4_dirty_inode+0x62/0xc0 fs/ext4/inode.c:5977 __mark_inode_dirty+0x825/0x1550 fs/fs-writeback.c:2129 generic_update_time+0x26a/0x450 fs/inode.c:1643 update_time fs/inode.c:1659 [inline] file_update_time+0x390/0x640 fs/inode.c:1870 ext4_page_mkwrite+0x1fe/0x1430 fs/ext4/inode.c:6125 do_page_mkwrite+0x14e/0x520 mm/memory.c:2380 do_shared_fault mm/memory.c:3706 [inline] do_fault mm/memory.c:3745 [inline] handle_pte_fault mm/memory.c:3972 [inline] __handle_mm_fault+0x2b5d/0x4460 mm/memory.c:4096 handle_mm_fault+0x53e/0xc80 mm/memory.c:4133 __do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1396 do_page_fault+0xf6/0x8c0 arch/x86/mm/fault.c:1471 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1160 RIP: 0033:0x405977 Code: 87 84 00 00 00 48 c1 e6 03 48 05 19 fc ff ff 48 f7 d8 48 89 c7 48 f7 d8 48 c1 f8 3f 48 21 c6 48 8d 04 33 48 39 d7 7e 49 48 89 <04> 24 48 8b 44 24 30 48 89 44 24 08 48 c1 e2 03 48 89 54 24 10 e8 RSP: 002b:00007ffc92564c50 EFLAGS: 00010287 RAX: 0000001b32322000 RBX: 0000000075fbdaa0 RCX: 0000001b33320000 RDX: 0000001b32322004 RSI: 0000000000000b9b RDI: ffffffff3a99ab9b RBP: 0000000000000102 R08: 000000003a99ab9b R09: 000000003a99ab9f R10: 00007ffc92564e00 R11: 0000000000000246 R12: 00000000009300a0 R13: 0000000080000000 R14: 00007fcb6ef67008 R15: 00000000000003c8 INFO: task syz-executor2:10603 blocked for more than 140 seconds. Not tainted 4.18.0-rc6+ #168 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor2 D23640 10603 4462 0x00000004 Call Trace: context_switch kernel/sched/core.c:2853 [inline] __schedule+0x87c/0x1ec0 kernel/sched/core.c:3501 schedule+0xfb/0x450 kernel/sched/core.c:3545 wait_transaction_locked+0x24d/0x310 fs/jbd2/transaction.c:159 add_transaction_credits+0x550/0xe90 fs/jbd2/transaction.c:187 start_this_handle+0x427/0x1260 fs/jbd2/transaction.c:357 jbd2__journal_start+0x3cb/0xa80 fs/jbd2/transaction.c:439 __ext4_journal_start_sb+0x182/0x600 fs/ext4/ext4_jbd2.c:81 __ext4_journal_start fs/ext4/ext4_jbd2.h:311 [inline] ext4_dirty_inode+0x62/0xc0 fs/ext4/inode.c:5977 __mark_inode_dirty+0x825/0x1550 fs/fs-writeback.c:2129 generic_update_time+0x26a/0x450 fs/inode.c:1643 update_time fs/inode.c:1659 [inline] file_update_time+0x390/0x640 fs/inode.c:1870 ext4_page_mkwrite+0x1fe/0x1430 fs/ext4/inode.c:6125 do_page_mkwrite+0x14e/0x520 mm/memory.c:2380 do_shared_fault mm/memory.c:3706 [inline] do_fault mm/memory.c:3745 [inline] handle_pte_fault mm/memory.c:3972 [inline] __handle_mm_fault+0x2b5d/0x4460 mm/memory.c:4096 handle_mm_fault+0x53e/0xc80 mm/memory.c:4133 __do_page_fault+0x620/0xe50 arch/x86/mm/fault.c:1396 do_page_fault+0xf6/0x8c0 arch/x86/mm/fault.c:1471 page_fault+0x1e/0x30 arch/x86/entry/entry_64.S:1160 RIP: 0033:0x405977 Code: 87 84 00 00 00 48 c1 e6 03 48 05 19 fc ff ff 48 f7 d8 48 89 c7 48 f7 d8 48 c1 f8 3f 48 21 c6 48 8d 04 33 48 39 d7 7e 49 48 89 <04> 24 48 8b 44 24 30 48 89 44 24 08 48 c1 e2 03 48 89 54 24 10 e8 RSP: 002b:00007ffcb37f6cf0 EFLAGS: 00010287 RAX: 0000001b32020000 RBX: 0000000000000003 RCX: 0000001b33020000 RDX: 0000001b32020004 RSI: 00007ffcb37f6ab0 RDI: 0000000000000000 RBP: 0000000000000010 R08: 0000000000000000 R09: 0000000000000013 R10: 0000000000000075 R11: 0000000000000246 R12: 0000000000000000 R13: 000000000002efae R14: 0000000000000064 R15: badc0ffeebadface Showing all locks held in the system: 4 locks held by kworker/u4:0/7: #0: 00000000f71414e8 ((wq_completion)"writeback"){+.+.}, at: __write_once_size include/linux/compiler.h:215 [inline] #0: 00000000f71414e8 ((wq_completion)"writeback"){+.+.}, at: arch_atomic64_set arch/x86/include/asm/atomic64_64.h:34 [inline] #0: 00000000f71414e8 ((wq_completion)"writeback"){+.+.}, at: atomic64_set include/asm-generic/atomic-instrumented.h:40 [inline] #0: 00000000f71414e8 ((wq_completion)"writeback"){+.+.}, at: atomic_long_set include/asm-generic/atomic-long.h:59 [inline] #0: 00000000f71414e8 ((wq_completion)"writeback"){+.+.}, at: set_work_data kernel/workqueue.c:617 [inline] #0: 00000000f71414e8 ((wq_completion)"writeback"){+.+.}, at: set_work_pool_and_clear_pending kernel/workqueue.c:644 [inline] #0: 00000000f71414e8 ((wq_completion)"writeback"){+.+.}, at: process_one_work+0xb44/0x1ba0 kernel/workqueue.c:2124 #1: 0000000011a3962d ((work_completion)(&(&wb->dwork)->work)){+.+.}, at: process_one_work+0xb9b/0x1ba0 kernel/workqueue.c:2128 #2: 0000000016b1cb37 (&type->s_umount_key#29){++++}, at: trylock_super+0x22/0x110 fs/super.c:409 #3: 0000000020f2404b (&sbi->s_journal_flag_rwsem){++++}, at: do_writepages+0x9a/0x1a0 mm/page-writeback.c:2341 1 lock held by khungtaskd/773: #0: 0000000038fab9bd (rcu_read_lock){....}, at: debug_show_all_locks+0xd0/0x428 kernel/locking/lockdep.c:4461 1 lock held by khugepaged/779: #0: 0000000052db25a3 (&mm->mmap_sem){++++}, at: collapse_huge_page+0x2b9/0x2140 mm/khugepaged.c:1006 3 locks held by rs:main Q:Reg/4317: #0: 00000000f787e003 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 #1: 0000000001742808 (sb_writers#6){.+.+}, at: file_start_write include/linux/fs.h:2738 [inline] #1: 0000000001742808 (sb_writers#6){.+.+}, at: vfs_write+0x452/0x560 fs/read_write.c:548 #2: 000000006cd1b582 (&sb->s_type->i_mutex_key#12){++++}, at: inode_trylock include/linux/fs.h:735 [inline] #2: 000000006cd1b582 (&sb->s_type->i_mutex_key#12){++++}, at: ext4_file_write_iter+0x2a1/0x1430 fs/ext4/file.c:232 1 lock held by rsyslogd/4319: #0: 00000000a9e1ed02 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x1bb/0x200 fs/file.c:766 2 locks held by getty/4409: #0: 000000004ff77e18 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000001e53ebf2 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4410: #0: 000000002244363b (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000f6a3786f (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4411: #0: 00000000160ae658 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000000a75c24 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4412: #0: 000000007874ec04 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000090d9babd (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4413: #0: 0000000073d7e7ec (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 000000007d649a7d (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4414: #0: 0000000018c54836 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 0000000076724f40 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by getty/4415: #0: 0000000075c22661 (&tty->ldisc_sem){++++}, at: ldsem_down_read+0x37/0x40 drivers/tty/tty_ldsem.c:365 #1: 00000000530cdc88 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x335/0x1ce0 drivers/tty/n_tty.c:2140 2 locks held by syz-fuzzer/4445: #0: 0000000052db25a3 (&mm->mmap_sem){++++}, at: __do_page_fault+0x389/0xe50 arch/x86/mm/fault.c:1325 #1: 0000000014e5605d (sb_pagefaults){.+.+}, at: sb_start_pagefault include/linux/fs.h:1583 [inline] #1: 0000000014e5605d (sb_pagefaults){.+.+}, at: ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6124 1 lock held by syz-fuzzer/4446: #0: 0000000052db25a3 (&mm->mmap_sem){++++}, at: __do_page_fault+0xae1/0xe50 arch/x86/mm/fault.c:1332 2 locks held by syz-executor0/4458: #0: 00000000bc5c7a00 (&type->i_mutex_dir_key){++++}, at: iterate_dir+0xd4/0x5d0 fs/readdir.c:41 #1: 0000000001742808 (sb_writers#6){.+.+}, at: sb_start_write_trylock include/linux/fs.h:1559 [inline] #1: 0000000001742808 (sb_writers#6){.+.+}, at: touch_atime+0x16e/0x320 fs/inode.c:1716 2 locks held by syz-executor3/4459: #0: 0000000001742808 (sb_writers#6){.+.+}, at: sb_start_write include/linux/fs.h:1554 [inline] #0: 0000000001742808 (sb_writers#6){.+.+}, at: mnt_want_write+0x3f/0xc0 fs/namespace.c:386 #1: 00000000f3513818 (&type->i_mutex_dir_key/1){+.+.}, at: inode_lock_nested include/linux/fs.h:750 [inline] #1: 00000000f3513818 (&type->i_mutex_dir_key/1){+.+.}, at: filename_create+0x1b2/0x5b0 fs/namei.c:3645 2 locks held by syz-executor7/4460: #0: 000000008f012af5 (&type->i_mutex_dir_key){++++}, at: iterate_dir+0xd4/0x5d0 fs/readdir.c:41 #1: 0000000001742808 (sb_writers#6){.+.+}, at: sb_start_write_trylock include/linux/fs.h:1559 [inline] #1: 0000000001742808 (sb_writers#6){.+.+}, at: touch_atime+0x16e/0x320 fs/inode.c:1716 3 locks held by syz-executor6/10547: 2 locks held by syz-executor4/10561: #0: 00000000a4f1acd5 (&mm->mmap_sem){++++}, at: __do_page_fault+0x389/0xe50 arch/x86/mm/fault.c:1325 #1: 0000000014e5605d (sb_pagefaults){.+.+}, at: sb_start_pagefault include/linux/fs.h:1583 [inline] #1: 0000000014e5605d (sb_pagefaults){.+.+}, at: ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6124 2 locks held by syz-executor2/10603: #0: 000000008bdccbee (&mm->mmap_sem){++++}, at: __do_page_fault+0x389/0xe50 arch/x86/mm/fault.c:1325 #1: 0000000014e5605d (sb_pagefaults){.+.+}, at: sb_start_pagefault include/linux/fs.h:1583 [inline] #1: 0000000014e5605d (sb_pagefaults){.+.+}, at: ext4_page_mkwrite+0x1d0/0x1430 fs/ext4/inode.c:6124 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 773 Comm: khungtaskd Not tainted 4.18.0-rc6+ #168 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+0x1c9/0x2b4 lib/dump_stack.c:113 nmi_cpu_backtrace.cold.4+0x19/0xce lib/nmi_backtrace.c:103 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace include/linux/nmi.h:138 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:196 [inline] watchdog+0x9c4/0xf80 kernel/hung_task.c:252 kthread+0x345/0x410 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:412 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 skipped: idling at native_safe_halt+0x6/0x10 arch/x86/include/asm/irqflags.h:54