INFO: task syz-executor.4:18035 blocked for more than 143 seconds. Not tainted 5.4.0-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D24760 18035 2027 0x00004004 Call Trace: context_switch kernel/sched/core.c:3385 [inline] __schedule+0x837/0xc50 kernel/sched/core.c:4081 schedule+0x181/0x210 kernel/sched/core.c:4155 io_schedule+0x8b/0x100 kernel/sched/core.c:5799 wait_on_page_bit_common+0x918/0xc90 mm/filemap.c:1175 wait_on_page_bit+0x46/0x50 mm/filemap.c:1224 wait_on_page_writeback+0x13e/0x180 mm/page-writeback.c:2822 __filemap_fdatawait_range+0x1b5/0x3b0 mm/filemap.c:526 file_write_and_wait_range+0x141/0x1a0 mm/filemap.c:786 __generic_file_fsync+0x76/0x1a0 fs/libfs.c:1000 fat_file_fsync+0x7c/0x190 fs/fat/file.c:199 vfs_fsync_range+0xfd/0x1a0 fs/sync.c:197 generic_write_sync include/linux/fs.h:2849 [inline] generic_file_write_iter+0x575/0x630 mm/filemap.c:3470 do_iter_readv_writev+0x651/0x8e0 include/linux/fs.h:1889 do_iter_write+0x180/0x590 fs/read_write.c:970 vfs_iter_write+0x7c/0xa0 fs/read_write.c:983 iter_file_splice_write+0x6d8/0xe20 fs/splice.c:746 do_splice_from fs/splice.c:848 [inline] direct_splice_actor+0xf7/0x130 fs/splice.c:1020 splice_direct_to_actor+0x463/0xac0 fs/splice.c:975 do_splice_direct+0x200/0x330 fs/splice.c:1063 do_sendfile+0x7e4/0xfd0 fs/read_write.c:1464 __do_sys_sendfile64 fs/read_write.c:1525 [inline] __se_sys_sendfile64 fs/read_write.c:1511 [inline] __x64_sys_sendfile64+0x176/0x1b0 fs/read_write.c:1511 do_syscall_64+0xf7/0x1c0 arch/x86/entry/common.c:294 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45a649 Code: ec 08 10 00 00 48 89 ac 24 00 10 00 00 48 8d ac 24 00 10 00 00 48 8b 59 20 48 85 db 75 67 48 8b b4 24 20 10 00 00 8b 8c 24 28 <10> 00 00 48 89 e7 f3 a4 48 8b 94 24 18 10 00 00 ff 12 48 8b 94 24 RSP: 002b:00007f0eaf749c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 000000000045a649 RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000004 RBP: 000000000075bfc8 R08: 0000000000000000 R09: 0000000000000000 R10: 00008080fffffffe R11: 0000000000000246 R12: 00007f0eaf74a6d4 R13: 00000000004c85ca R14: 00000000004dec58 R15: 00000000ffffffff Showing all locks held in the system: 2 locks held by kworker/u4:1/21: #0: ffff8880aea36f58 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1215 [inline] #0: ffff8880aea36f58 (&rq->lock){-.-.}, at: __schedule+0xdb/0xc50 kernel/sched/core.c:4029 #1: ffffffff88ad41c0 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207 1 lock held by khungtaskd/1081: #0: ffffffff88ad41c0 (rcu_read_lock){....}, at: rcu_lock_acquire+0x4/0x30 include/linux/rcupdate.h:207 2 locks held by rsyslogd/7685: #0: ffff8880a05b03a0 (&f->f_pos_lock){+.+.}, at: __fdget_pos+0x243/0x2e0 fs/file.c:801 #1: ffff8880aea36f58 (&rq->lock){-.-.}, at: rq_lock kernel/sched/sched.h:1215 [inline] #1: ffff8880aea36f58 (&rq->lock){-.-.}, at: __schedule+0xdb/0xc50 kernel/sched/core.c:4029 2 locks held by getty/7775: #0: ffff8880a46ff090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f052e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7776: #0: ffff88809bca1090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f292e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7777: #0: ffff88809280e090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f212e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7778: #0: ffff88809c015090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f252e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7779: #0: ffff8880a193d090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f112e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7780: #0: ffff8880a168b090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005f152e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 2 locks held by getty/7781: #0: ffff88809a218090 (&tty->ldisc_sem){++++}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:272 #1: ffffc90005ef12e0 (&ldata->atomic_read_lock){+.+.}, at: n_tty_read+0x221/0x1b00 drivers/tty/n_tty.c:2156 1 lock held by syz-executor.4/18035: #0: ffff8880a069c428 (sb_writers#17){.+.+}, at: file_start_write include/linux/fs.h:2878 [inline] #0: ffff8880a069c428 (sb_writers#17){.+.+}, at: do_sendfile+0x7c2/0xfd0 fs/read_write.c:1463 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 1081 Comm: khungtaskd Not tainted 5.4.0-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+0x1fb/0x318 lib/dump_stack.c:118 nmi_cpu_backtrace+0xaf/0x1a0 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x174/0x290 lib/nmi_backtrace.c:62 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38 trigger_all_cpu_backtrace+0x17/0x20 include/linux/nmi.h:146 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline] watchdog+0xd49/0xd60 kernel/hung_task.c:289 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.4.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_nc_worker RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:752 [inline] RIP: 0010:__local_bh_disable_ip+0xe5/0x170 kernel/softirq.c:130 Code: 48 c1 e8 03 42 80 3c 20 00 74 0c 48 c7 c7 68 95 aa 88 e8 fe d2 66 00 48 83 3d 1e 6a 62 07 00 0f 84 86 00 00 00 4c 89 ff 57 9d <0f> 1f 44 00 00 65 8b 05 6b f2 b9 7e 25 ff ff ff 7f 39 d8 75 58 4c RSP: 0018:ffff8880a9a17b90 EFLAGS: 00000286 RAX: 1ffffffff11552ad RBX: 0000000000000201 RCX: 1ffff11014e7edf1 RDX: 0000000000000000 RSI: 0000000000000201 RDI: 0000000000000286 RBP: ffff8880a9a17bb0 R08: ffff8880a9a04dd8 R09: fffffbfff12fd1af R10: fffffbfff12fd1af R11: 0000000000000000 R12: dffffc0000000000 R13: ffffffff876cfd80 R14: ffffffff876cf8f9 R15: 0000000000000286 FS: 0000000000000000(0000) GS:ffff8880aea00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f27b40261e0 CR3: 0000000092c6f000 CR4: 00000000001406f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __raw_spin_lock_bh include/linux/spinlock_api_smp.h:134 [inline] _raw_spin_lock_bh+0x1b/0x50 kernel/locking/spinlock.c:175 spin_lock_bh include/linux/spinlock.h:343 [inline] batadv_nc_purge_paths+0xe9/0x440 net/batman-adv/network-coding.c:441 batadv_nc_worker+0x345/0x600 net/batman-adv/network-coding.c:721 process_one_work+0x7ef/0x10d0 kernel/workqueue.c:2264 worker_thread+0xc01/0x1630 kernel/workqueue.c:2410 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352