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bfoster@redhat.com, kent.overstreet@linux.dev, linux-bcachefs@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Transfer-Encoding: quoted-printable Message-Id: References: <67c0c335.050a0220.222324.0271.GAE@google.com> To: syzbot X-Mailer: Apple Mail (2.3826.500.181.1.5) On Feb 28, 2025, at 03:55, syzbot = wrote: >=20 > Hello, >=20 > syzbot found the following issue on: >=20 > HEAD commit: d082ecbc71e9 Linux 6.14-rc4 > git tree: upstream > console output: = https://syzkaller.appspot.com/x/log.txt?x=3D11fe26e4580000 > kernel config: = https://syzkaller.appspot.com/x/.config?x=3D8de9cc84d5960254 > dashboard link: = https://syzkaller.appspot.com/bug?extid=3D23e4a7772eb9a9715b85 > 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=3D15fe26e4580000 >=20 > Downloadable assets: > disk image: = https://storage.googleapis.com/syzbot-assets/5efd609bee65/disk-d082ecbc.ra= w.xz > vmlinux: = https://storage.googleapis.com/syzbot-assets/dfadbc41acd8/vmlinux-d082ecbc= .xz > kernel image: = https://storage.googleapis.com/syzbot-assets/50189caf8ad6/bzImage-d082ecbc= .xz > mounted in repro: = https://storage.googleapis.com/syzbot-assets/470a5d56ad27/mount_0.gz >=20 > The issue was bisected to: >=20 > commit 1d16c605cc55ef26f0c65b362665a6c99080ccbc > Author: Kent Overstreet > Date: Thu Nov 9 19:22:46 2023 +0000 >=20 > bcachefs: Disk space accounting rewrite >=20 > bisection log: = https://syzkaller.appspot.com/x/bisect.txt?x=3D117c9db0580000 > final oops: = https://syzkaller.appspot.com/x/report.txt?x=3D137c9db0580000 > console output: = https://syzkaller.appspot.com/x/log.txt?x=3D157c9db0580000 >=20 > IMPORTANT: if you fix the issue, please add the following tag to the = commit: > Reported-by: syzbot+23e4a7772eb9a9715b85@syzkaller.appspotmail.com > Fixes: 1d16c605cc55 ("bcachefs: Disk space accounting rewrite") >=20 > INFO: task syz-executor:5849 blocked for more than 143 seconds. > Not tainted 6.14.0-rc4-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this = message. > task:syz-executor state:D stack:20592 pid:5849 tgid:5849 = ppid:5843 task_flags:0x400100 flags:0x00000002 > Call Trace: > > context_switch kernel/sched/core.c:5378 [inline] > __schedule+0x18bc/0x4c40 kernel/sched/core.c:6765 > __schedule_loop kernel/sched/core.c:6842 [inline] > schedule+0x14b/0x320 kernel/sched/core.c:6857 > schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6914 > __mutex_lock_common kernel/locking/mutex.c:662 [inline] > __mutex_lock+0x817/0x1010 kernel/locking/mutex.c:730 > pipe_release+0x48/0x320 fs/pipe.c:728 > __fput+0x3e9/0x9f0 fs/file_table.c:464 > __do_sys_close fs/open.c:1580 [inline] > __se_sys_close fs/open.c:1565 [inline] > __x64_sys_close+0x7f/0x110 fs/open.c:1565 > 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: 0033:0x7fe6de58bda0 > RSP: 002b:00007fff16f18de8 EFLAGS: 00000202 ORIG_RAX: 0000000000000003 > RAX: ffffffffffffffda RBX: 0000555580184ec0 RCX: 00007fe6de58bda0 > RDX: 0000000000000000 RSI: 0000000000000004 RDI: 000000000000001d > RBP: 00005555801847a0 R08: 0000000000000001 R09: 0000000000000000 > R10: 0000000000000008 R11: 0000000000000202 R12: 00007fff16f18e10 > R13: 0000000000000023 R14: 0000555580184f0c R15: 00005555801854c8 > > INFO: task syz.3.64:6573 blocked for more than 143 seconds. > Not tainted 6.14.0-rc4-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this = message. > task:syz.3.64 state:D stack:10240 pid:6573 tgid:6572 = ppid:5971 task_flags:0x400140 flags:0x00004004 > Call Trace: > > context_switch kernel/sched/core.c:5378 [inline] > __schedule+0x18bc/0x4c40 kernel/sched/core.c:6765 > __schedule_loop kernel/sched/core.c:6842 [inline] > schedule+0x14b/0x320 kernel/sched/core.c:6857 > io_schedule+0x8d/0x110 kernel/sched/core.c:7690 > folio_wait_bit_common+0x839/0xee0 mm/filemap.c:1318 > folio_lock include/linux/pagemap.h:1163 [inline] > invalidate_inode_pages2_range+0x48f/0x960 mm/truncate.c:639 > bch2_write_invalidate_inode_pages_range+0xce/0x120 = fs/bcachefs/fs-io-pagecache.c:68 > bch2_direct_write+0x2ebf/0x3190 fs/bcachefs/fs-io-direct.c:653 > bch2_write_iter+0x19d/0x2cd0 fs/bcachefs/fs-io-buffered.c:1047 > iter_file_splice_write+0xbfa/0x1510 fs/splice.c:743 > do_splice_from fs/splice.c:941 [inline] > direct_splice_actor+0x11b/0x220 fs/splice.c:1164 > splice_direct_to_actor+0x586/0xc80 fs/splice.c:1108 > do_splice_direct_actor fs/splice.c:1207 [inline] > do_splice_direct+0x289/0x3e0 fs/splice.c:1233 > do_sendfile+0x564/0x8a0 fs/read_write.c:1363 > __do_sys_sendfile64 fs/read_write.c:1424 [inline] > __se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1410 > 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: 0033:0x7f893338d169 > RSP: 002b:00007f89342ae038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 > RAX: ffffffffffffffda RBX: 00007f89335a5fa0 RCX: 00007f893338d169 > RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000006 > RBP: 00007f893340e2a0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000000fffa83 R11: 0000000000000246 R12: 0000000000000000 > R13: 0000000000000000 R14: 00007f89335a5fa0 R15: 00007fffa972dc48 > > INFO: task syz.3.64:6613 blocked for more than 144 seconds. > Not tainted 6.14.0-rc4-syzkaller #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this = message. > task:syz.3.64 state:D stack:15824 pid:6613 tgid:6572 = ppid:5971 task_flags:0x440140 flags:0x00004004 > Call Trace: > > context_switch kernel/sched/core.c:5378 [inline] > __schedule+0x18bc/0x4c40 kernel/sched/core.c:6765 > __schedule_loop kernel/sched/core.c:6842 [inline] > schedule+0x14b/0x320 kernel/sched/core.c:6857 > __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_unbounded+0x708/0x820 mm/readahead.c:298 > filemap_readahead mm/filemap.c:2549 [inline] > filemap_get_pages+0x9e4/0x1fb0 mm/filemap.c:2594 > filemap_splice_read+0x68e/0xef0 mm/filemap.c:2971 > do_splice_read fs/splice.c:985 [inline] > splice_file_to_pipe+0x290/0x500 fs/splice.c:1295 > do_sendfile+0x508/0x8a0 fs/read_write.c:1369 > __do_sys_sendfile64 fs/read_write.c:1424 [inline] > __se_sys_sendfile64+0x17c/0x1e0 fs/read_write.c:1410 > 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: 0033:0x7f893338d169 > RSP: 002b:00007f893428d038 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 > RAX: ffffffffffffffda RBX: 00007f89335a6080 RCX: 00007f893338d169 > RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000000 > RBP: 00007f893340e2a0 R08: 0000000000000000 R09: 0000000000000000 > R10: 00000000000002ab R11: 0000000000000246 R12: 0000000000000000 > R13: 0000000000000000 R14: 00007f89335a6080 R15: 00007fffa972dc48 > >=20 > Showing all locks held in the system: > 1 lock held by khungtaskd/30: > #0: ffffffff8eb38f60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire = include/linux/rcupdate.h:337 [inline] > #0: ffffffff8eb38f60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock = include/linux/rcupdate.h:849 [inline] > #0: ffffffff8eb38f60 (rcu_read_lock){....}-{1:3}, at: = debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746 > 2 locks held by getty/5582: > #0: ffff88803571a0a0 (&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+0x616/0x1770 drivers/tty/n_tty.c:2211 > 1 lock held by syz-executor/5849: > #0: ffff88802a3d6068 (&pipe->mutex){+.+.}-{4:4}, at: = pipe_release+0x48/0x320 fs/pipe.c:728 > 4 locks held by kworker/u8:4/6005: > #0: ffff8880b873e7d8 (&rq->__lock){-.-.}-{2:2}, at: = raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:598 > #1: ffff8880b8728948 (&per_cpu_ptr(group->pcpu, = cpu)->seq){-.-.}-{0:0}, at: psi_task_switch+0x41d/0x7a0 = kernel/sched/psi.c:987 > #2: ffff8880b872a398 (&base->lock){-.-.}-{2:2}, at: lock_timer_base = kernel/time/timer.c:1046 [inline] > #2: ffff8880b872a398 (&base->lock){-.-.}-{2:2}, at: = __mod_timer+0x24a/0x10e0 kernel/time/timer.c:1127 > #3: ffffffff9a832208 (&obj_hash[i].lock){-.-.}-{2:2}, at: = debug_object_activate+0x17f/0x580 lib/debugobjects.c:818 > 1 lock held by syz.3.64/6573: > #0: ffff8880741e2420 (sb_writers#13){.+.+}-{0:0}, at: = direct_splice_actor+0x49/0x220 fs/splice.c:1163 > 2 locks held by syz.3.64/6613: > #0: ffff88802a3d6068 (&pipe->mutex){+.+.}-{4:4}, at: = splice_file_to_pipe+0x2e/0x500 fs/splice.c:1292 > #1: ffff8880744ba148 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: = filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] > #1: ffff8880744ba148 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: = page_cache_ra_unbounded+0x156/0x820 mm/readahead.c:229 >=20 > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D >=20 > NMI backtrace for cpu 0 > CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted = 6.14.0-rc4-syzkaller #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, = BIOS Google 02/12/2025 > Call Trace: > > __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:236 [inline] > watchdog+0x1058/0x10a0 kernel/hung_task.c:399 > 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 > > Sending NMI from CPU 0 to CPUs 1: > NMI backtrace for cpu 1 skipped: idling at native_safe_halt = arch/x86/include/asm/irqflags.h:48 [inline] > NMI backtrace for cpu 1 skipped: idling at arch_safe_halt = arch/x86/include/asm/irqflags.h:106 [inline] > NMI backtrace for cpu 1 skipped: idling at acpi_safe_halt+0x21/0x30 = drivers/acpi/processor_idle.c:111 >=20 >=20 > --- > 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 syzkaller@googlegroups.com. >=20 > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. > For information about bisection process see: = https://goo.gl/tpsmEJ#bisection >=20 > If the report is already addressed, let syzbot know by replying with: > #syz fix: exact-commit-title >=20 > 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. >=20 > 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) >=20 > If the report is a duplicate of another one, reply with: > #syz dup: exact-subject-of-another-report >=20 > If you want to undo deduplication, reply with: > #syz undup >=20 #syz fix: bcachefs: Fix readahead involved deadlock