bisecting fixing commit since 1722257b8ececec9b3b83a8b14058f8209d78071 building syzkaller on 1ba81399e2d03b53a7e631c4ab05f25af1fb1911 testing commit 1722257b8ececec9b3b83a8b14058f8209d78071 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 5f42c432d2cedc7f7d8dfb3ab4ab5c51722171717f36ca3e30b63a9da7489488 all runs: crashed: INFO: task hung in fuse_flush testing current HEAD 5c66974a63046780925e5d99b6dc6631fe2f9a31 testing commit 5c66974a63046780925e5d99b6dc6631fe2f9a31 compiler: gcc version 8.4.1 20210217 (GCC) kernel signature: 6c813542e13bdb4f8bba590d377dbe628e04364f3fa8146f3a8f86d1ccb8b72b run #0: crashed: INFO: task hung in fuse_flush run #1: crashed: INFO: task hung in fuse_launder_page run #2: crashed: INFO: task hung in fuse_launder_page run #3: crashed: INFO: task hung in fuse_launder_page run #4: crashed: INFO: task hung in fuse_launder_page run #5: crashed: INFO: task hung in fuse_launder_page run #6: crashed: INFO: task hung in fuse_launder_page run #7: crashed: INFO: task hung in fuse_flush run #8: crashed: INFO: task hung in fuse_flush run #9: crashed: INFO: task hung in fuse_flush revisions tested: 2, total time: 30m28.236595543s (build: 17m51.900132935s, test: 12m9.478552421s) the crash still happens on HEAD commit msg: Linux 4.19.202 crash: INFO: task hung in fuse_flush Bluetooth: hci4: command 0x0406 tx timeout Bluetooth: hci1: command 0x0406 tx timeout Bluetooth: hci5: command 0x0406 tx timeout ieee802154 phy0 wpan0: encryption failed: -22 ieee802154 phy1 wpan1: encryption failed: -22 INFO: task syz-executor.2:9914 blocked for more than 140 seconds. Not tainted 4.19.202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D28232 9914 8485 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3bb/0x780 kernel/locking/rwsem-xadd.c:618 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+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] fuse_flush+0x1a2/0x600 fs/fuse/file.c:421 filp_close+0x9a/0x120 fs/open.c:1162 __close_fd+0x100/0x1a0 fs/file.c:636 __do_sys_close fs/open.c:1181 [inline] __se_sys_close+0x3f/0x80 fs/open.c:1179 __x64_sys_close+0x2c/0x40 fs/open.c:1179 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4193eb Code: Bad RIP value. RSP: 002b:00007ffc8fdbef50 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004193eb RDX: 0000001b2de2014c RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2de20150 R10: 0004de557961b0b2 R11: 0000000000000293 R12: 000000000056cb00 R13: 000000000056cb00 R14: 000000000056bf80 R15: 000000000000c0b1 INFO: task syz-executor.2:9922 blocked for more than 140 seconds. Not tainted 4.19.202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D26312 9922 8485 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 fuse_wait_on_page_writeback fs/fuse/file.c:383 [inline] fuse_wait_on_page_writeback+0xee/0x130 fs/fuse/file.c:379 fuse_launder_page fs/fuse/file.c:2033 [inline] fuse_launder_page+0x92/0xc0 fs/fuse/file.c:2026 do_launder_page mm/truncate.c:655 [inline] invalidate_inode_pages2_range+0x686/0xdb0 mm/truncate.c:725 invalidate_inode_pages2+0x12/0x20 mm/truncate.c:766 fuse_finish_open+0x234/0x4d0 fs/fuse/file.c:182 fuse_open_common+0x1e4/0x240 fs/fuse/file.c:222 fuse_open+0xb/0x10 fs/fuse/file.c:286 do_dentry_open+0x3f1/0x1020 fs/open.c:796 vfs_open+0x9a/0xc0 fs/open.c:902 do_last fs/namei.c:3421 [inline] path_openat+0x925/0x2900 fs/namei.c:3537 do_filp_open+0x177/0x250 fs/namei.c:3567 do_sys_open+0x1dc/0x350 fs/open.c:1085 __do_sys_open fs/open.c:1103 [inline] __se_sys_open fs/open.c:1098 [inline] __x64_sys_open+0x79/0xb0 fs/open.c:1098 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 Code: 6e 6f 6e 65 75 b4 31 c0 e9 5e ff ff ff 0f 1f 40 00 48 83 f8 05 75 1f 48 8b 4c 24 30 81 39 63 72 61 73 75 96 80 79 04 68 75 90 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 RSP: 002b:00007f6c14cb3188 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000080380 RDI: 0000000020000100 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffc8fdbeeef R14: 00007f6c14cb3300 R15: 0000000000022000 INFO: task syz-executor.0:9941 blocked for more than 140 seconds. Not tainted 4.19.202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28232 9941 8490 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3bb/0x780 kernel/locking/rwsem-xadd.c:618 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+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] fuse_flush+0x1a2/0x600 fs/fuse/file.c:421 filp_close+0x9a/0x120 fs/open.c:1162 __close_fd+0x100/0x1a0 fs/file.c:636 __do_sys_close fs/open.c:1181 [inline] __se_sys_close+0x3f/0x80 fs/open.c:1179 __x64_sys_close+0x2c/0x40 fs/open.c:1179 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4193eb Code: 80 ff 13 0f 85 15 05 00 00 48 89 b4 24 88 00 00 00 0f b7 7e 32 66 0f 1f 84 00 00 00 00 00 90 66 f7 c7 00 80 0f 85 3a 04 00 00 <0f> b7 4e 30 66 83 f9 01 0f 85 84 03 00 00 0f b6 7e 14 0f 1f 00 40 RSP: 002b:00007ffceb14a2a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004193eb RDX: 0000001b2e32014c RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2e320150 R10: 0008fed68334ca28 R11: 0000000000000293 R12: 000000000056cb00 R13: 000000000056cb00 R14: 000000000056bf80 R15: 000000000000c13b INFO: task syz-executor.0:9950 blocked for more than 140 seconds. Not tainted 4.19.202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D27848 9950 8490 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 fuse_wait_on_page_writeback fs/fuse/file.c:383 [inline] fuse_wait_on_page_writeback+0xee/0x130 fs/fuse/file.c:379 fuse_launder_page fs/fuse/file.c:2033 [inline] fuse_launder_page+0x92/0xc0 fs/fuse/file.c:2026 do_launder_page mm/truncate.c:655 [inline] invalidate_inode_pages2_range+0x686/0xdb0 mm/truncate.c:725 invalidate_inode_pages2+0x12/0x20 mm/truncate.c:766 fuse_finish_open+0x234/0x4d0 fs/fuse/file.c:182 fuse_open_common+0x1e4/0x240 fs/fuse/file.c:222 fuse_open+0xb/0x10 fs/fuse/file.c:286 do_dentry_open+0x3f1/0x1020 fs/open.c:796 vfs_open+0x9a/0xc0 fs/open.c:902 do_last fs/namei.c:3421 [inline] path_openat+0x925/0x2900 fs/namei.c:3537 do_filp_open+0x177/0x250 fs/namei.c:3567 do_sys_open+0x1dc/0x350 fs/open.c:1085 __do_sys_open fs/open.c:1103 [inline] __se_sys_open fs/open.c:1098 [inline] __x64_sys_open+0x79/0xb0 fs/open.c:1098 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 Code: 6e 6f 6e 65 75 b4 31 c0 e9 5e ff ff ff 0f 1f 40 00 48 83 f8 05 75 1f 48 8b 4c 24 30 81 39 63 72 61 73 75 96 80 79 04 68 75 90 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 RSP: 002b:00007fc2dabd8188 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000080380 RDI: 0000000020000100 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffceb14a23f R14: 00007fc2dabd8300 R15: 0000000000022000 INFO: task syz-executor.1:9947 blocked for more than 140 seconds. Not tainted 4.19.202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D28232 9947 8493 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3bb/0x780 kernel/locking/rwsem-xadd.c:618 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+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] fuse_flush+0x1a2/0x600 fs/fuse/file.c:421 filp_close+0x9a/0x120 fs/open.c:1162 __close_fd+0x100/0x1a0 fs/file.c:636 __do_sys_close fs/open.c:1181 [inline] __se_sys_close+0x3f/0x80 fs/open.c:1179 __x64_sys_close+0x2c/0x40 fs/open.c:1179 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4193eb Code: 80 ff 13 0f 85 15 05 00 00 48 89 b4 24 88 00 00 00 0f b7 7e 32 66 0f 1f 84 00 00 00 00 00 90 66 f7 c7 00 80 0f 85 3a 04 00 00 <0f> b7 4e 30 66 83 f9 01 0f 85 84 03 00 00 0f b6 7e 14 0f 1f 00 40 RSP: 002b:00007fffbf0f85e0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004193eb RDX: 0000001b2e82014c RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2e820150 R10: 00094805b3c374cc R11: 0000000000000293 R12: 000000000056cb00 R13: 000000000056cb00 R14: 000000000056bf80 R15: 000000000000c145 INFO: task syz-executor.1:9958 blocked for more than 140 seconds. Not tainted 4.19.202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D27560 9958 8493 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 fuse_wait_on_page_writeback fs/fuse/file.c:383 [inline] fuse_wait_on_page_writeback+0xee/0x130 fs/fuse/file.c:379 fuse_launder_page fs/fuse/file.c:2033 [inline] fuse_launder_page+0x92/0xc0 fs/fuse/file.c:2026 do_launder_page mm/truncate.c:655 [inline] invalidate_inode_pages2_range+0x686/0xdb0 mm/truncate.c:725 invalidate_inode_pages2+0x12/0x20 mm/truncate.c:766 fuse_finish_open+0x234/0x4d0 fs/fuse/file.c:182 fuse_open_common+0x1e4/0x240 fs/fuse/file.c:222 fuse_open+0xb/0x10 fs/fuse/file.c:286 do_dentry_open+0x3f1/0x1020 fs/open.c:796 vfs_open+0x9a/0xc0 fs/open.c:902 do_last fs/namei.c:3421 [inline] path_openat+0x925/0x2900 fs/namei.c:3537 do_filp_open+0x177/0x250 fs/namei.c:3567 do_sys_open+0x1dc/0x350 fs/open.c:1085 __do_sys_open fs/open.c:1103 [inline] __se_sys_open fs/open.c:1098 [inline] __x64_sys_open+0x79/0xb0 fs/open.c:1098 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 Code: 6e 6f 6e 65 75 b4 31 c0 e9 5e ff ff ff 0f 1f 40 00 48 83 f8 05 75 1f 48 8b 4c 24 30 81 39 63 72 61 73 75 96 80 79 04 68 75 90 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 RSP: 002b:00007f67bf507188 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000080380 RDI: 0000000020000100 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fffbf0f857f R14: 00007f67bf507300 R15: 0000000000022000 INFO: task syz-executor.4:9981 blocked for more than 140 seconds. Not tainted 4.19.202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D28232 9981 8491 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3bb/0x780 kernel/locking/rwsem-xadd.c:618 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+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] fuse_flush+0x1a2/0x600 fs/fuse/file.c:421 filp_close+0x9a/0x120 fs/open.c:1162 __close_fd+0x100/0x1a0 fs/file.c:636 __do_sys_close fs/open.c:1181 [inline] __se_sys_close+0x3f/0x80 fs/open.c:1179 __x64_sys_close+0x2c/0x40 fs/open.c:1179 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4193eb Code: 80 ff 13 0f 85 15 05 00 00 48 89 b4 24 88 00 00 00 0f b7 7e 32 66 0f 1f 84 00 00 00 00 00 90 66 f7 c7 00 80 0f 85 3a 04 00 00 <0f> b7 4e 30 66 83 f9 01 0f 85 84 03 00 00 0f b6 7e 14 0f 1f 00 40 RSP: 002b:00007fff7fa071c0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004193eb RDX: 0000001b2e52014c RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2e520150 R10: 000d5bdbb4398432 R11: 0000000000000293 R12: 000000000056cb00 R13: 000000000056cb00 R14: 000000000056bf80 R15: 000000000000c1ce INFO: task syz-executor.4:9983 blocked for more than 140 seconds. Not tainted 4.19.202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D27560 9983 8491 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 fuse_wait_on_page_writeback fs/fuse/file.c:383 [inline] fuse_wait_on_page_writeback+0xee/0x130 fs/fuse/file.c:379 fuse_launder_page fs/fuse/file.c:2033 [inline] fuse_launder_page+0x92/0xc0 fs/fuse/file.c:2026 do_launder_page mm/truncate.c:655 [inline] invalidate_inode_pages2_range+0x686/0xdb0 mm/truncate.c:725 invalidate_inode_pages2+0x12/0x20 mm/truncate.c:766 fuse_finish_open+0x234/0x4d0 fs/fuse/file.c:182 fuse_open_common+0x1e4/0x240 fs/fuse/file.c:222 fuse_open+0xb/0x10 fs/fuse/file.c:286 do_dentry_open+0x3f1/0x1020 fs/open.c:796 vfs_open+0x9a/0xc0 fs/open.c:902 do_last fs/namei.c:3421 [inline] path_openat+0x925/0x2900 fs/namei.c:3537 do_filp_open+0x177/0x250 fs/namei.c:3567 do_sys_open+0x1dc/0x350 fs/open.c:1085 __do_sys_open fs/open.c:1103 [inline] __se_sys_open fs/open.c:1098 [inline] __x64_sys_open+0x79/0xb0 fs/open.c:1098 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 Code: 6e 6f 6e 65 75 b4 31 c0 e9 5e ff ff ff 0f 1f 40 00 48 83 f8 05 75 1f 48 8b 4c 24 30 81 39 63 72 61 73 75 96 80 79 04 68 75 90 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 RSP: 002b:00007f5e75e4b188 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000080380 RDI: 0000000020000100 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007fff7fa0715f R14: 00007f5e75e4b300 R15: 0000000000022000 INFO: task syz-executor.5:9984 blocked for more than 140 seconds. Not tainted 4.19.202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28232 9984 8488 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 __rwsem_down_write_failed_common kernel/locking/rwsem-xadd.c:589 [inline] rwsem_down_write_failed+0x3bb/0x780 kernel/locking/rwsem-xadd.c:618 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+0x53/0x90 kernel/locking/rwsem.c:72 inode_lock include/linux/fs.h:748 [inline] fuse_flush+0x1a2/0x600 fs/fuse/file.c:421 filp_close+0x9a/0x120 fs/open.c:1162 __close_fd+0x100/0x1a0 fs/file.c:636 __do_sys_close fs/open.c:1181 [inline] __se_sys_close+0x3f/0x80 fs/open.c:1179 __x64_sys_close+0x2c/0x40 fs/open.c:1179 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4193eb Code: 80 ff 13 0f 85 15 05 00 00 48 89 b4 24 88 00 00 00 0f b7 7e 32 66 0f 1f 84 00 00 00 00 00 90 66 f7 c7 00 80 0f 85 3a 04 00 00 <0f> b7 4e 30 66 83 f9 01 0f 85 84 03 00 00 0f b6 7e 14 0f 1f 00 40 RSP: 002b:00007ffe0181d1d0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000004193eb RDX: 0000001b2e02014c RSI: 0000000000000000 RDI: 0000000000000005 RBP: 0000000000000001 R08: 0000000000000000 R09: 0000001b2e020150 R10: 000e28fbbedcab16 R11: 0000000000000293 R12: 000000000056cb00 R13: 000000000056cb00 R14: 000000000056bf80 R15: 000000000000c1e9 INFO: task syz-executor.5:9987 blocked for more than 140 seconds. Not tainted 4.19.202-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D27640 9987 8488 0x00000004 Call Trace: context_switch kernel/sched/core.c:2828 [inline] __schedule+0x80c/0x1f70 kernel/sched/core.c:3517 schedule+0x7f/0x1b0 kernel/sched/core.c:3561 fuse_wait_on_page_writeback fs/fuse/file.c:383 [inline] fuse_wait_on_page_writeback+0xee/0x130 fs/fuse/file.c:379 fuse_launder_page fs/fuse/file.c:2033 [inline] fuse_launder_page+0x92/0xc0 fs/fuse/file.c:2026 do_launder_page mm/truncate.c:655 [inline] invalidate_inode_pages2_range+0x686/0xdb0 mm/truncate.c:725 invalidate_inode_pages2+0x12/0x20 mm/truncate.c:766 fuse_finish_open+0x234/0x4d0 fs/fuse/file.c:182 fuse_open_common+0x1e4/0x240 fs/fuse/file.c:222 fuse_open+0xb/0x10 fs/fuse/file.c:286 do_dentry_open+0x3f1/0x1020 fs/open.c:796 vfs_open+0x9a/0xc0 fs/open.c:902 do_last fs/namei.c:3421 [inline] path_openat+0x925/0x2900 fs/namei.c:3537 do_filp_open+0x177/0x250 fs/namei.c:3567 do_sys_open+0x1dc/0x350 fs/open.c:1085 __do_sys_open fs/open.c:1103 [inline] __se_sys_open fs/open.c:1098 [inline] __x64_sys_open+0x79/0xb0 fs/open.c:1098 do_syscall_64+0xd0/0x4e0 arch/x86/entry/common.c:293 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x4665d9 Code: 6e 6f 6e 65 75 b4 31 c0 e9 5e ff ff ff 0f 1f 40 00 48 83 f8 05 75 1f 48 8b 4c 24 30 81 39 63 72 61 73 75 96 80 79 04 68 75 90 0b 00 00 00 66 90 e9 35 ff ff ff 48 83 f8 06 75 3d 48 8b 4c 24 RSP: 002b:00007fd2f6010188 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 RAX: ffffffffffffffda RBX: 000000000056bf80 RCX: 00000000004665d9 RDX: 0000000000000000 RSI: 0000000000080380 RDI: 0000000020000100 RBP: 00000000004bfcb9 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80 R13: 00007ffe0181d16f R14: 00007fd2f6010300 R15: 0000000000022000 Showing all locks held in the system: 1 lock held by khungtaskd/1570: #0: 00000000ec385699 (rcu_read_lock){....}, at: debug_show_all_locks+0x5b/0x27a kernel/locking/lockdep.c:4443 1 lock held by syz-executor.2/9914: #0: 0000000035d5b5f6 (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #0: 0000000035d5b5f6 (&sb->s_type->i_mutex_key#21){+.+.}, at: fuse_flush+0x1a2/0x600 fs/fuse/file.c:421 2 locks held by syz-executor.2/9922: #0: 00000000fd7dce73 (sb_writers#14){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000fd7dce73 (sb_writers#14){.+.+}, at: mnt_want_write+0x3c/0xa0 fs/namespace.c:360 #1: 0000000035d5b5f6 (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 0000000035d5b5f6 (&sb->s_type->i_mutex_key#21){+.+.}, at: fuse_open_common+0x14d/0x240 fs/fuse/file.c:215 1 lock held by syz-executor.0/9941: #0: 000000004caa90af (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000004caa90af (&sb->s_type->i_mutex_key#21){+.+.}, at: fuse_flush+0x1a2/0x600 fs/fuse/file.c:421 2 locks held by syz-executor.0/9950: #0: 00000000a6ea639c (sb_writers#14){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000a6ea639c (sb_writers#14){.+.+}, at: mnt_want_write+0x3c/0xa0 fs/namespace.c:360 #1: 000000004caa90af (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000004caa90af (&sb->s_type->i_mutex_key#21){+.+.}, at: fuse_open_common+0x14d/0x240 fs/fuse/file.c:215 1 lock held by syz-executor.1/9947: #0: 000000000d1c66c8 (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000000d1c66c8 (&sb->s_type->i_mutex_key#21){+.+.}, at: fuse_flush+0x1a2/0x600 fs/fuse/file.c:421 2 locks held by syz-executor.1/9958: #0: 00000000e08c386c (sb_writers#14){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000e08c386c (sb_writers#14){.+.+}, at: mnt_want_write+0x3c/0xa0 fs/namespace.c:360 #1: 000000000d1c66c8 (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000000d1c66c8 (&sb->s_type->i_mutex_key#21){+.+.}, at: fuse_open_common+0x14d/0x240 fs/fuse/file.c:215 1 lock held by syz-executor.4/9981: #0: 000000001614c0d9 (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000001614c0d9 (&sb->s_type->i_mutex_key#21){+.+.}, at: fuse_flush+0x1a2/0x600 fs/fuse/file.c:421 2 locks held by syz-executor.4/9983: #0: 000000005222b399 (sb_writers#14){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 000000005222b399 (sb_writers#14){.+.+}, at: mnt_want_write+0x3c/0xa0 fs/namespace.c:360 #1: 000000001614c0d9 (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000001614c0d9 (&sb->s_type->i_mutex_key#21){+.+.}, at: fuse_open_common+0x14d/0x240 fs/fuse/file.c:215 1 lock held by syz-executor.5/9984: #0: 000000007e546a65 (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #0: 000000007e546a65 (&sb->s_type->i_mutex_key#21){+.+.}, at: fuse_flush+0x1a2/0x600 fs/fuse/file.c:421 2 locks held by syz-executor.5/9987: #0: 00000000e26bc35d (sb_writers#14){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 00000000e26bc35d (sb_writers#14){.+.+}, at: mnt_want_write+0x3c/0xa0 fs/namespace.c:360 #1: 000000007e546a65 (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 000000007e546a65 (&sb->s_type->i_mutex_key#21){+.+.}, at: fuse_open_common+0x14d/0x240 fs/fuse/file.c:215 1 lock held by syz-executor.3/9997: #0: 00000000ea09a372 (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #0: 00000000ea09a372 (&sb->s_type->i_mutex_key#21){+.+.}, at: fuse_flush+0x1a2/0x600 fs/fuse/file.c:421 2 locks held by syz-executor.3/9998: #0: 0000000060892192 (sb_writers#14){.+.+}, at: sb_start_write include/linux/fs.h:1579 [inline] #0: 0000000060892192 (sb_writers#14){.+.+}, at: mnt_want_write+0x3c/0xa0 fs/namespace.c:360 #1: 00000000ea09a372 (&sb->s_type->i_mutex_key#21){+.+.}, at: inode_lock include/linux/fs.h:748 [inline] #1: 00000000ea09a372 (&sb->s_type->i_mutex_key#21){+.+.}, at: fuse_open_common+0x14d/0x240 fs/fuse/file.c:215 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1570 Comm: khungtaskd Not tainted 4.19.202-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+0x17c/0x226 lib/dump_stack.c:118 nmi_cpu_backtrace.cold.0+0x3c/0x78 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0xf6/0x120 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:146 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:203 [inline] watchdog+0x5c3/0xb40 kernel/hung_task.c:287 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 4.19.202-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet RIP: 0010:debug_lockdep_rcu_enabled+0x57/0x90 kernel/rcu/update.c:253 Code: 84 d2 75 4c 8b 15 2d 4e 6e 09 85 d2 74 3e 48 c7 c7 40 4a e3 89 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 0f b6 14 02 <48> 89 f8 83 e0 07 83 c0 03 38 d0 7c 04 84 d2 75 1c 8b 05 32 17 98 RSP: 0018:ffff8880b599fb58 EFLAGS: 00000806 RAX: dffffc0000000000 RBX: dffffc0000000000 RCX: 0000000000000002 RDX: 0000000000000004 RSI: 0000000000000000 RDI: ffffffff89e34a40 RBP: ffff8880b599fb58 R08: 0000000000000000 R09: 0000000000000000 R10: ffffed1017464552 R11: ffff8880ba322a93 R12: 0000000000000002 R13: 0000000000000000 R14: 0000000000000000 R15: ffff8880b59901c0 FS: 0000000000000000(0000) GS:ffff8880ba300000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f61cf493028 CR3: 00000000a99ee000 CR4: 00000000001406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: trace_lock_acquire include/trace/events/lock.h:13 [inline] lock_acquire+0x2e3/0x3a0 kernel/locking/lockdep.c:3907 rcu_lock_acquire include/linux/rcupdate.h:242 [inline] rcu_read_lock include/linux/rcupdate.h:627 [inline] batadv_iv_ogm_slide_own_bcast_window net/batman-adv/bat_iv_ogm.c:942 [inline] batadv_iv_ogm_schedule_buff+0x4fa/0xfd0 net/batman-adv/bat_iv_ogm.c:1008 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1052 [inline] batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1045 [inline] batadv_iv_send_outstanding_bat_ogm_packet+0x59e/0x810 net/batman-adv/bat_iv_ogm.c:1871 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2153 worker_thread+0x85/0xb60 kernel/workqueue.c:2296 kthread+0x347/0x410 kernel/kthread.c:259 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415