On Jan 2, 2025, at 04:12, syzbot <[email protected]> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 8155b4ef3466 Add linux-next specific files for 20241220 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=16914af8580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=9c90bb7161a56c88 > dashboard link: https://syzkaller.appspot.com/bug?extid=20254ae9982bc25a0dc7 > compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) > 2.40 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=170cd0b0580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=14e432c4580000 > > Downloadable assets: > disk image: > https://storage.googleapis.com/syzbot-assets/98a974fc662d/disk-8155b4ef.raw.xz > vmlinux: > https://storage.googleapis.com/syzbot-assets/2dea9b72f624/vmlinux-8155b4ef.xz > kernel image: > https://storage.googleapis.com/syzbot-assets/593a42b9eb34/bzImage-8155b4ef.xz > mounted in repro: > https://storage.googleapis.com/syzbot-assets/6a0c6a4d1204/mount_0.gz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: [email protected] > > INFO: task syz-executor210:6087 blocked for more than 143 seconds. > Not tainted 6.13.0-rc3-next-20241220-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor210 state:D stack:24704 pid:6087 tgid:6048 ppid:5829 > flags:0x00004006 > Call Trace: > <TASK> > context_switch kernel/sched/core.c:5371 [inline] > __schedule+0x189f/0x4c80 kernel/sched/core.c:6758 > __schedule_loop kernel/sched/core.c:6835 [inline] > schedule+0x14b/0x320 kernel/sched/core.c:6850 > io_schedule+0x8d/0x110 kernel/sched/core.c:7683 > folio_wait_bit_common+0x839/0xee0 mm/filemap.c:1309 > folio_lock include/linux/pagemap.h:1172 [inline] > truncate_inode_pages_range+0xc1f/0x10e0 mm/truncate.c:380 > bchfs_fallocate+0x2d1/0x730 fs/bcachefs/fs-io.c:756 > bch2_fallocate_dispatch+0x3ac/0x540 fs/bcachefs/fs-io.c:809 > vfs_fallocate+0x623/0x7a0 fs/open.c:338 > do_vfs_ioctl+0x258c/0x2e40 fs/ioctl.c:885 > __do_sys_ioctl fs/ioctl.c:904 [inline] > __se_sys_ioctl+0x80/0x170 fs/ioctl.c:892 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f4a9fb35589 > RSP: 002b:00007f4a9faca168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 > RAX: ffffffffffffffda RBX: 00007f4a9fbc26d8 RCX: 00007f4a9fb35589 > RDX: 0000000020000180 RSI: 0000000040305839 RDI: 0000000000000006 > RBP: 00007f4a9fbc26d0 R08: 00007f4a9faca6c0 R09: 0000000000000000 > R10: 00007f4a9faca6c0 R11: 0000000000000246 R12: 00007f4a9fbc26dc > R13: 000000000000006e R14: 00007ffc05424e00 R15: 00007ffc05424ee8 > </TASK> > INFO: task syz-executor210:6091 blocked for more than 144 seconds. > Not tainted 6.13.0-rc3-next-20241220-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor210 state:D stack:25936 pid:6091 tgid:6048 ppid:5829 > flags:0x00000006 > Call Trace: > <TASK> > context_switch kernel/sched/core.c:5371 [inline] > __schedule+0x189f/0x4c80 kernel/sched/core.c:6758 > __schedule_loop kernel/sched/core.c:6835 [inline] > schedule+0x14b/0x320 kernel/sched/core.c:6850 > __bch2_two_state_lock+0x229/0x2c0 fs/bcachefs/two_state_shared_lock.c:7 > bch2_two_state_lock fs/bcachefs/two_state_shared_lock.h:55 [inline] > bch2_readahead+0x9e1/0x1240 fs/bcachefs/fs-io-buffered.c:272 > read_pages+0x179/0x570 mm/readahead.c:161 > page_cache_ra_order+0x7ee/0xba0 mm/readahead.c:504 > page_cache_sync_readahead include/linux/pagemap.h:1413 [inline] > filemap_get_pages+0x605/0x2080 mm/filemap.c:2528 > filemap_splice_read+0x68e/0xef0 mm/filemap.c:2904 > do_splice_read fs/splice.c:985 [inline] > splice_direct_to_actor+0x4af/0xc80 fs/splice.c:1089 > do_splice_direct_actor fs/splice.c:1207 [inline] > do_splice_direct+0x289/0x3e0 fs/splice.c:1233 > vfs_copy_file_range+0xd1f/0x14f0 fs/read_write.c:1620 > __do_sys_copy_file_range fs/read_write.c:1670 [inline] > __se_sys_copy_file_range+0x3fa/0x600 fs/read_write.c:1637 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f4a9fb35589 > RSP: 002b:00007f4a9faa9158 EFLAGS: 00000212 ORIG_RAX: 0000000000000146 > RAX: ffffffffffffffda RBX: 00007f4a9fbc26e8 RCX: 00007f4a9fb35589 > RDX: 0000000000000004 RSI: 0000000000000000 RDI: 0000000000000005 > RBP: 00007f4a9fbc26e0 R08: 0000000000000080 R09: 0000000000000000 > R10: 0000000020000280 R11: 0000000000000212 R12: 00007f4a9fbc26ec > R13: 000000000000006e R14: 00007ffc05424e00 R15: 00007ffc05424ee8 > </TASK> > > Showing all locks held in the system: > 1 lock held by pool_workqueue_/3: > 1 lock held by ksoftirqd/0/16: > #0: ffff8880b863e998 (&rq->__lock){-.-.}-{2:2}, at: > raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598 > 1 lock held by khungtaskd/30: > #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire > include/linux/rcupdate.h:337 [inline] > #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock > include/linux/rcupdate.h:849 [inline] > #0: ffffffff8e937da0 (rcu_read_lock){....}-{1:3}, at: > debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6744 > 2 locks held by getty/5585: > #0: ffff88814dc4d0a0 (&tty->ldisc_sem){++++}-{0:0}, at: > tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 > #1: ffffc90002fde2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: > n_tty_read+0x6a6/0x1e00 drivers/tty/n_tty.c:2211 > 2 locks held by syz-executor210/6087: > #0: ffff8880297ba420 (sb_writers#10){.+.+}-{0:0}, at: file_start_write > include/linux/fs.h:3012 [inline] > #0: ffff8880297ba420 (sb_writers#10){.+.+}-{0:0}, at: > vfs_fallocate+0x59d/0x7a0 fs/open.c:337 > #1: ffff8880731bb670 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: > inode_lock include/linux/fs.h:863 [inline] > #1: ffff8880731bb670 (&sb->s_type->i_mutex_key#15){+.+.}-{4:4}, at: > bch2_fallocate_dispatch+0x1e2/0x540 fs/bcachefs/fs-io.c:800 > 1 lock held by syz-executor210/6091: > #0: ffff8880731bb810 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: > filemap_invalidate_lock_shared include/linux/fs.h:918 [inline] > #0: ffff8880731bb810 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: > page_cache_ra_order+0x325/0xba0 mm/readahead.c:480 > 1 lock held by syz-executor210/10791: > #0: ffffffff8e7e2e88 (wq_pool_mutex){+.+.}-{4:4}, at: apply_wqattrs_lock > kernel/workqueue.c:5170 [inline] > #0: ffffffff8e7e2e88 (wq_pool_mutex){+.+.}-{4:4}, at: > __alloc_workqueue+0xa55/0x1f20 kernel/workqueue.c:5724 > 1 lock held by syz-executor210/10793: > #0: ffffffff8e7e2e88 (wq_pool_mutex){+.+.}-{4:4}, at: apply_wqattrs_lock > kernel/workqueue.c:5170 [inline] > #0: ffffffff8e7e2e88 (wq_pool_mutex){+.+.}-{4:4}, at: > __alloc_workqueue+0xa55/0x1f20 kernel/workqueue.c:5724 > 1 lock held by syz-executor210/10795: > #0: ffffffff8e7e2e88 (wq_pool_mutex){+.+.}-{4:4}, at: apply_wqattrs_lock > kernel/workqueue.c:5170 [inline] > #0: ffffffff8e7e2e88 (wq_pool_mutex){+.+.}-{4:4}, at: > __alloc_workqueue+0xa55/0x1f20 kernel/workqueue.c:5724 > 1 lock held by syz-executor210/10797: > #0: ffffffff8e7e2e88 (wq_pool_mutex){+.+.}-{4:4}, at: apply_wqattrs_lock > kernel/workqueue.c:5170 [inline] > #0: ffffffff8e7e2e88 (wq_pool_mutex){+.+.}-{4:4}, at: > __alloc_workqueue+0xa55/0x1f20 kernel/workqueue.c:5724 > > ============================================= > > NMI backtrace for cpu 1 > CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted > 6.13.0-rc3-next-20241220-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 09/13/2024 > Call Trace: > <TASK> > __dump_stack lib/dump_stack.c:94 [inline] > dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120 > nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 > nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 > trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] > check_hung_uninterruptible_tasks kernel/hung_task.c:234 [inline] > watchdog+0xff6/0x1040 kernel/hung_task.c:397 > kthread+0x7a9/0x920 kernel/kthread.c:464 > ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:148 > ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 > </TASK> > Sending NMI from CPU 1 to CPUs 0: > NMI backtrace for cpu 0 > CPU: 0 UID: 0 PID: 10791 Comm: syz-executor210 Not tainted > 6.13.0-rc3-next-20241220-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 09/13/2024 > RIP: 0010:native_save_fl arch/x86/include/asm/irqflags.h:19 [inline] > RIP: 0010:arch_local_save_flags arch/x86/include/asm/irqflags.h:87 [inline] > RIP: 0010:arch_local_irq_save arch/x86/include/asm/irqflags.h:123 [inline] > RIP: 0010:lock_release+0x175/0xa30 kernel/locking/lockdep.c:5866 > Code: f7 e8 3f ec 8a 00 48 c7 c0 10 77 e4 93 49 39 06 0f 84 ee 04 00 00 4c 8d > b4 24 b0 00 00 00 4c 89 f3 48 c1 eb 03 42 80 3c 3b 00 <74> 08 4c 89 f7 e8 01 > ed 8a 00 4c 89 6c 24 50 48 c7 84 24 b0 00 00 > RSP: 0018:ffffc90000007760 EFLAGS: 00000046 > RAX: ffffffff93e47710 RBX: 1ffff92000000f02 RCX: ffffffff819ab2c0 > RDX: 0000000000000000 RSI: ffffffff8c5fece0 RDI: ffffffff8c5feca0 > RBP: ffffc900000078a0 R08: ffffffff901ab1f7 R09: 1ffffffff203563e > R10: dffffc0000000000 R11: fffffbfff203563f R12: 1ffff92000000ef8 > R13: ffffffff819875fd R14: ffffc90000007810 R15: dffffc0000000000 > FS: 00007f4a9faeb6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 00007f4a98294000 CR3: 000000003352a000 CR4: 00000000003526f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > <NMI> > </NMI> > <IRQ> > do_write_seqcount_end include/linux/seqlock.h:522 [inline] > psi_group_change+0xae5/0x1190 kernel/sched/psi.c:867 > psi_task_change+0xed/0x270 kernel/sched/psi.c:912 > psi_enqueue kernel/sched/stats.h:162 [inline] > enqueue_task+0x2b4/0x330 kernel/sched/core.c:2070 > activate_task kernel/sched/core.c:2110 [inline] > ttwu_do_activate+0x1d1/0x760 kernel/sched/core.c:3722 > ttwu_queue kernel/sched/core.c:3995 [inline] > try_to_wake_up+0x89b/0x1470 kernel/sched/core.c:4323 > call_timer_fn+0x187/0x650 kernel/time/timer.c:1793 > expire_timers kernel/time/timer.c:1844 [inline] > __run_timers kernel/time/timer.c:2418 [inline] > __run_timer_base+0x66a/0x8e0 kernel/time/timer.c:2430 > run_timer_base kernel/time/timer.c:2439 [inline] > run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2449 > handle_softirqs+0x2d4/0x9b0 kernel/softirq.c:561 > __do_softirq kernel/softirq.c:595 [inline] > invoke_softirq kernel/softirq.c:435 [inline] > __irq_exit_rcu+0xf7/0x220 kernel/softirq.c:662 > irq_exit_rcu+0x9/0x30 kernel/softirq.c:678 > instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline] > sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049 > </IRQ> > <TASK> > asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702 > RIP: 0010:console_trylock_spinning kernel/printk/printk.c:2061 [inline] > RIP: 0010:vprintk_emit+0x700/0xa10 kernel/printk/printk.c:2431 > Code: 00 e8 f4 c7 20 00 4c 8d bc 24 a0 00 00 00 4d 85 e4 75 07 e8 e2 c7 20 00 > eb 06 e8 db c7 20 00 fb 49 bc 00 00 00 00 00 fc ff df <48> c7 c7 60 37 81 8e > 31 f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 > RSP: 0018:ffffc90003747140 EFLAGS: 00000293 > RAX: ffffffff819e5c45 RBX: 0000000000000000 RCX: ffff888079b8da00 > RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 > RBP: ffffc90003747250 R08: ffffffff819e5c1e R09: 1ffffffff285af23 > R10: dffffc0000000000 R11: fffffbfff285af24 R12: dffffc0000000000 > R13: 1ffff920006e8e2c R14: ffffffff819e5a80 R15: ffffc900037471e0 > bch2_print_maybe_redirect fs/bcachefs/super.c:117 [inline] > __bch2_print+0x17a/0x220 fs/bcachefs/super.c:136 > bch2_fs_online+0x240/0x860 fs/bcachefs/super.c:690 > bch2_fs_alloc fs/bcachefs/super.c:946 [inline] > bch2_fs_open+0x2cec/0x2d60 fs/bcachefs/super.c:2055 > bch2_fs_get_tree+0x738/0x1740 fs/bcachefs/fs.c:2187 > vfs_get_tree+0x90/0x2b0 fs/super.c:1814 > do_new_mount+0x2be/0xb40 fs/namespace.c:3556 > do_mount fs/namespace.c:3896 [inline] > __do_sys_mount fs/namespace.c:4107 [inline] > __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4084 > do_syscall_x64 arch/x86/entry/common.c:52 [inline] > do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 > entry_SYSCALL_64_after_hwframe+0x77/0x7f > RIP: 0033:0x7f4a9fb369da > Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 > 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 > 01 c3 48 c7 c1 b0 ff ff ff f7 d8 64 89 01 48 > RSP: 002b:00007f4a9faeafd8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 > RAX: ffffffffffffffda RBX: 00007f4a9faeaff0 RCX: 00007f4a9fb369da > RDX: 00000000200000c0 RSI: 0000000020000180 RDI: 00007f4a9faeaff0 > RBP: 0000000000000004 R08: 00007f4a9faeb030 R09: 00000000000059d0 > R10: 0000000000000010 R11: 0000000000000282 R12: 00007f4a9faeb030 > R13: 0000000000000010 R14: 0000000000000003 R15: 0000000001000000 > </TASK> > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at [email protected]. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title > > If you want syzbot to run the reproducer, reply with: > #syz test: git://repo/address.git branch-or-commit-hash > If you attach or paste a git patch, syzbot will apply it before testing. > > If you want to overwrite report's subsystems, reply with: > #syz set subsystems: new-subsystem > (See the list of subsystem names on the web dashboard) > > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report > > If you want to undo deduplication, reply with: > #syz undup >
#syz fix: bcachefs: Fix readahead involved deadlock
