On Feb 28, 2025, at 15:59, syzbot <syzbot+de1434c5355cc909b...@syzkaller.appspotmail.com> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: 1e15510b71c9 Merge tag 'net-6.14-rc5' of git://git.kernel... > git tree: upstream > console+strace: https://syzkaller.appspot.com/x/log.txt?x=164eca97980000 > kernel config: https://syzkaller.appspot.com/x/.config?x=8de9cc84d5960254 > dashboard link: https://syzkaller.appspot.com/bug?extid=de1434c5355cc909b734 > 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=11d297b8580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=119af064580000 > > Downloadable assets: > disk image: > https://storage.googleapis.com/syzbot-assets/ac4579f25f13/disk-1e15510b.raw.xz > vmlinux: > https://storage.googleapis.com/syzbot-assets/c342a1d6167e/vmlinux-1e15510b.xz > kernel image: > https://storage.googleapis.com/syzbot-assets/d985a65df547/bzImage-1e15510b.xz > mounted in repro: > https://storage.googleapis.com/syzbot-assets/4860c171e0ab/mount_0.gz > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+de1434c5355cc909b...@syzkaller.appspotmail.com > > INFO: task syz-executor337:5843 blocked for more than 143 seconds. > Not tainted 6.14.0-rc4-syzkaller-00169-g1e15510b71c9 #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor337 state:D stack:11416 pid:5843 tgid:5842 ppid:5840 > task_flags:0x400140 flags:0x00004006 > Call Trace: > <TASK> > 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:637 > 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: 0033:0x7f49c6338bd9 > RSP: 002b:00007f49c62ef218 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 > RAX: ffffffffffffffda RBX: 00007f49c63c66c8 RCX: 00007f49c6338bd9 > RDX: 0000000000000000 RSI: 0000000000000005 RDI: 0000000000000005 > RBP: 00007f49c63c66c0 R08: 0000000000000000 R09: 0000000000000000 > R10: 0000000800000009 R11: 0000000000000246 R12: 00007f49c6392ae4 > R13: 0031656c69662f2e R14: 0000400000000240 R15: 0000400000000040 > </TASK> > INFO: task syz-executor337:5854 blocked for more than 143 seconds. > Not tainted 6.14.0-rc4-syzkaller-00169-g1e15510b71c9 #0 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > task:syz-executor337 state:D stack:19160 pid:5854 tgid:5842 ppid:5840 > task_flags:0x440140 flags:0x00004006 > Call Trace: > <TASK> > 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_order+0xa36/0xca0 mm/readahead.c:516 > filemap_get_pages+0x59a/0x1fb0 mm/filemap.c:2580 > filemap_splice_read+0x68e/0xef0 mm/filemap.c:2971 > 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 > 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: 0033:0x7f49c6338bd9 > RSP: 002b:00007f49c62ce218 EFLAGS: 00000246 ORIG_RAX: 0000000000000028 > RAX: ffffffffffffffda RBX: 00007f49c63c66d8 RCX: 00007f49c6338bd9 > RDX: 0000000000000000 RSI: 0000000000000006 RDI: 0000000000000006 > RBP: 00007f49c63c66d0 R08: 0000000000000000 R09: 0000000000000000 > R10: 000000000e3aa6ea R11: 0000000000000246 R12: 00007f49c6392ae4 > R13: 0031656c69662f2e R14: 0000400000000240 R15: 0000400000000040 > </TASK> > > Showing all locks held in the system: > 1 lock held by khungtaskd/30: > #0: ffffffff8eb38fa0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire > include/linux/rcupdate.h:337 [inline] > #0: ffffffff8eb38fa0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock > include/linux/rcupdate.h:849 [inline] > #0: ffffffff8eb38fa0 (rcu_read_lock){....}-{1:3}, at: > debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6746 > 2 locks held by getty/5583: > #0: ffff88803112f0a0 (&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-executor337/5843: > #0: ffff88807c384420 (sb_writers#9){.+.+}-{0:0}, at: > direct_splice_actor+0x49/0x220 fs/splice.c:1163 > 1 lock held by syz-executor337/5854: > #0: ffff888077d68a80 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: > filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] > #0: ffff888077d68a80 (mapping.invalidate_lock#3){.+.+}-{4:4}, at: > page_cache_ra_order+0x45d/0xca0 mm/readahead.c:492 > > ============================================= > > NMI backtrace for cpu 0 > CPU: 0 UID: 0 PID: 30 Comm: khungtaskd Not tainted > 6.14.0-rc4-syzkaller-00169-g1e15510b71c9 #0 > Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS > Google 02/12/2025 > 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: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 > </TASK> > 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 > > > --- > 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 syzkal...@googlegroups.com. > > 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 test: https://github.com/alanskind/bcachefs 9191195d0412c6e190292198d4fc3d4ee996d019
