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We increased write ref, if the fs went to RO, that would lead to a deadlock, it actually happens: 00171 ========= TEST generic/279 00171 00172 bcachefs (vdb): starting version 1.12: rebalance_work_acct_fix opts=nocow 00172 bcachefs (vdb): recovering from clean shutdown, journal seq 35 00172 bcachefs (vdb): accounting_read... done 00172 bcachefs (vdb): alloc_read... done 00172 bcachefs (vdb): stripes_read... done 00172 bcachefs (vdb): snapshots_read... done 00172 bcachefs (vdb): journal_replay... done 00172 bcachefs (vdb): resume_logged_ops... done 00172 bcachefs (vdb): going read-write 00172 bcachefs (vdb): done starting filesystem 00172 FSTYP -- bcachefs 00172 PLATFORM -- Linux/aarch64 farm3-kvm 6.11.0-rc1-ktest-g3e290a0b8e34 #7030 SMP Tue Oct 8 14:15:12 UTC 2024 00172 MKFS_OPTIONS -- --nocow /dev/vdc 00172 MOUNT_OPTIONS -- /dev/vdc /mnt/scratch 00172 00172 bcachefs (vdc): starting version 1.12: rebalance_work_acct_fix opts=nocow 00172 bcachefs (vdc): initializing new filesystem 00172 bcachefs (vdc): going read-write 00172 bcachefs (vdc): marking superblocks 00172 bcachefs (vdc): initializing freespace 00172 bcachefs (vdc): done initializing freespace 00172 bcachefs (vdc): reading snapshots table 00172 bcachefs (vdc): reading snapshots done 00172 bcachefs (vdc): done starting filesystem 00173 bcachefs (vdc): shutting down 00173 bcachefs (vdc): going read-only 00173 bcachefs (vdc): finished waiting for writes to stop 00173 bcachefs (vdc): flushing journal and stopping allocators, journal seq 4 00173 bcachefs (vdc): flushing journal and stopping allocators complete, journal seq 6 00173 bcachefs (vdc): shutdown complete, journal seq 7 00173 bcachefs (vdc): marking filesystem clean 00173 bcachefs (vdc): shutdown complete 00173 bcachefs (vdb): shutting down 00173 bcachefs (vdb): going read-only 00361 INFO: task umount:6180 blocked for more than 122 seconds. 00361 Not tainted 6.11.0-rc1-ktest-g3e290a0b8e34 #7030 00361 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 00361 task:umount state:D stack:0 pid:6180 tgid:6180 ppid:6176 flags:0x00000004 00361 Call trace: 00362 __switch_to (arch/arm64/kernel/process.c:556) 00362 __schedule (kernel/sched/core.c:5191 kernel/sched/core.c:6529) 00363 schedule (include/asm-generic/bitops/generic-non-atomic.h:128 include/linux/thread_info.h:192 include/linux/sched.h:2084 kernel/sched/core.c:6608 kernel/sched/core.c:6621) 00365 bch2_fs_read_only (fs/bcachefs/super.c:346 (discriminator 41)) 00367 __bch2_fs_stop (fs/bcachefs/super.c:620) 00368 bch2_put_super (fs/bcachefs/fs.c:1942) 00369 generic_shutdown_super (include/linux/list.h:373 (discriminator 2) fs/super.c:650 (discriminator 2)) 00371 bch2_kill_sb (fs/bcachefs/fs.c:2170) 00372 deactivate_locked_super (fs/super.c:434 fs/super.c:475) 00373 deactivate_super (fs/super.c:508) 00374 cleanup_mnt (fs/namespace.c:250 fs/namespace.c:1374) 00376 __cleanup_mnt (fs/namespace.c:1381) 00376 task_work_run (include/linux/sched.h:2024 kernel/task_work.c:224) 00377 do_notify_resume (include/linux/resume_user_mode.h:50 arch/arm64/kernel/entry-common.c:151) 00377 el0_svc (arch/arm64/include/asm/daifflags.h:28 arch/arm64/kernel/entry-common.c:171 arch/arm64/kernel/entry-common.c:178 arch/arm64/kernel/entry-common.c:713) 00377 el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:731) 00378 el0t_64_sync (arch/arm64/kernel/entry.S:598) 00378 INFO: task tee:6182 blocked for more than 122 seconds. 00378 Not tainted 6.11.0-rc1-ktest-g3e290a0b8e34 #7030 00378 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. 00378 task:tee state:D stack:0 pid:6182 tgid:6182 ppid:533 flags:0x00000004 00378 Call trace: 00378 __switch_to (arch/arm64/kernel/process.c:556) 00378 __schedule (kernel/sched/core.c:5191 kernel/sched/core.c:6529) 00378 schedule (include/asm-generic/bitops/generic-non-atomic.h:128 include/linux/thread_info.h:192 include/linux/sched.h:2084 kernel/sched/core.c:6608 kernel/sched/core.c:6621) 00378 schedule_preempt_disabled (kernel/sched/core.c:6680) 00379 rwsem_down_read_slowpath (kernel/locking/rwsem.c:1073 (discriminator 1)) 00379 down_read (kernel/locking/rwsem.c:1529) 00381 bch2_gc_gens (fs/bcachefs/sb-members.h:77 fs/bcachefs/sb-members.h:88 fs/bcachefs/sb-members.h:128 fs/bcachefs/btree_gc.c:1240) 00383 bch2_fs_store_inner (fs/bcachefs/sysfs.c:473) 00385 bch2_fs_internal_store (fs/bcachefs/sysfs.c:417 fs/bcachefs/sysfs.c:580 fs/bcachefs/sysfs.c:576) 00386 sysfs_kf_write (fs/sysfs/file.c:137) 00387 kernfs_fop_write_iter (fs/kernfs/file.c:334) 00389 vfs_write (fs/read_write.c:497 fs/read_write.c:590) 00390 ksys_write (fs/read_write.c:643) 00391 __arm64_sys_write (fs/read_write.c:652) 00391 invoke_syscall.constprop.0 (arch/arm64/include/asm/syscall.h:61 arch/arm64/kernel/syscall.c:54) 00392 do_el0_svc (include/linux/thread_info.h:127 (discriminator 2) arch/arm64/kernel/syscall.c:140 (discriminator 2) arch/arm64/kernel/syscall.c:151 (discriminator 2)) 00392 el0_svc (arch/arm64/include/asm/irqflags.h:55 arch/arm64/include/asm/irqflags.h:76 arch/arm64/kernel/entry-common.c:165 arch/arm64/kernel/entry-common.c:178 arch/arm64/kernel/entry-common.c:713) 00392 el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:731) 00392 el0t_64_sync (arch/arm64/kernel/entry.S:598) Signed-off-by: Alan Huang <mmpgouride@gmail.com> Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.