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[syzbot] [bcachefs?] possible deadlock in bch2_trans_begin | 0 (1) | 2025/01/20 02:27 |
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[syzbot] [bcachefs?] possible deadlock in bch2_trans_begin | 0 (1) | 2025/01/20 02:27 |
bcachefs (loop1): fatal error - emergency read only ====================================================== WARNING: possible circular locking dependency detected 6.15.0-syzkaller-07774-g90b83efa6701 #0 Not tainted ------------------------------------------------------ syz.1.4585/23691 is trying to acquire lock: ffff888031488140 (bcachefs_btree){+.+.}-{0:0}, at: trans_set_locked fs/bcachefs/btree_locking.h:206 [inline] ffff888031488140 (bcachefs_btree){+.+.}-{0:0}, at: trans_set_locked fs/bcachefs/btree_locking.h:203 [inline] ffff888031488140 (bcachefs_btree){+.+.}-{0:0}, at: bch2_trans_begin+0x104d/0x1670 fs/bcachefs/btree_iter.c:3338 but task is already holding lock: ffff8880455528e0 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] ffff8880455528e0 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: page_cache_ra_order+0x322/0xd00 mm/readahead.c:491 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #7 (mapping.invalidate_lock#5){.+.+}-{4:4}: down_read+0x9b/0x480 kernel/locking/rwsem.c:1524 filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] filemap_fault+0x2d8/0x2730 mm/filemap.c:3391 bch2_page_fault+0x203/0x880 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0x10d/0x490 mm/memory.c:5098 do_read_fault mm/memory.c:5518 [inline] do_fault mm/memory.c:5652 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x39fb/0x5450 mm/memory.c:6140 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 do_user_addr_fault+0x7a6/0x1370 arch/x86/mm/fault.c:1387 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 copy_user_generic arch/x86/include/asm/uaccess_64.h:126 [inline] raw_copy_from_user arch/x86/include/asm/uaccess_64.h:141 [inline] _inline_copy_from_user include/linux/uaccess.h:178 [inline] _copy_from_user+0x93/0xd0 lib/usercopy.c:18 copy_from_user include/linux/uaccess.h:212 [inline] copy_from_sockptr_offset include/linux/sockptr.h:48 [inline] copy_from_sockptr include/linux/sockptr.h:61 [inline] do_sock_getsockopt+0x5f4/0x800 net/socket.c:2345 __sys_getsockopt+0x12f/0x260 net/socket.c:2386 __do_sys_getsockopt net/socket.c:2393 [inline] __se_sys_getsockopt net/socket.c:2390 [inline] __x64_sys_getsockopt+0xbd/0x160 net/socket.c:2390 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #6 (&mm->mmap_lock){++++}-{4:4}: __might_fault mm/memory.c:7151 [inline] __might_fault+0x113/0x190 mm/memory.c:7145 drm_mode_atomic_ioctl+0x502/0x25f0 drivers/gpu/drm/drm_atomic_uapi.c:1458 drm_ioctl_kernel+0x1f4/0x3e0 drivers/gpu/drm/drm_ioctl.c:796 drm_ioctl+0x5c9/0xc30 drivers/gpu/drm/drm_ioctl.c:893 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:907 [inline] __se_sys_ioctl fs/ioctl.c:893 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:893 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #5 (crtc_ww_class_mutex){+.+.}-{4:4}: ww_acquire_init include/linux/ww_mutex.h:162 [inline] drm_modeset_acquire_init+0x237/0x410 drivers/gpu/drm/drm_modeset_lock.c:250 drmm_mode_config_init+0x113d/0x18d0 drivers/gpu/drm/drm_mode_config.c:469 vkms_modeset_init drivers/gpu/drm/vkms/vkms_drv.c:127 [inline] vkms_create drivers/gpu/drm/vkms/vkms_drv.c:191 [inline] vkms_init+0x392/0x730 drivers/gpu/drm/vkms/vkms_drv.c:221 do_one_initcall+0x123/0x6e0 init/main.c:1257 do_initcall_level init/main.c:1319 [inline] do_initcalls init/main.c:1335 [inline] do_basic_setup init/main.c:1354 [inline] kernel_init_freeable+0x5c2/0x900 init/main.c:1567 kernel_init+0x1c/0x2b0 init/main.c:1457 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #4 (crtc_ww_class_acquire){+.+.}-{0:0}: ww_acquire_init include/linux/ww_mutex.h:161 [inline] drm_modeset_acquire_init+0x21c/0x410 drivers/gpu/drm/drm_modeset_lock.c:250 drm_client_modeset_commit_atomic+0xc4/0x7e0 drivers/gpu/drm/drm_client_modeset.c:1040 drm_client_modeset_commit_locked+0x14d/0x580 drivers/gpu/drm/drm_client_modeset.c:1204 drm_client_modeset_commit+0x4f/0x80 drivers/gpu/drm/drm_client_modeset.c:1230 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:237 [inline] __drm_fb_helper_restore_fbdev_mode_unlocked+0x19f/0x200 drivers/gpu/drm/drm_fb_helper.c:216 drm_fb_helper_set_par+0xd8/0x120 drivers/gpu/drm/drm_fb_helper.c:1359 fbcon_init+0x8ab/0x1900 drivers/video/fbdev/core/fbcon.c:1112 visual_init+0x320/0x620 drivers/tty/vt/vt.c:1011 do_bind_con_driver.isra.0+0x57a/0xbf0 drivers/tty/vt/vt.c:3831 do_take_over_console+0x4f4/0x650 drivers/tty/vt/vt.c:4397 do_fbcon_takeover+0xe8/0x210 drivers/video/fbdev/core/fbcon.c:548 do_fb_registered drivers/video/fbdev/core/fbcon.c:2989 [inline] fbcon_fb_registered+0x375/0x6a0 drivers/video/fbdev/core/fbcon.c:3009 do_register_framebuffer+0x46d/0x800 drivers/video/fbdev/core/fbmem.c:449 register_framebuffer+0x23/0x40 drivers/video/fbdev/core/fbmem.c:515 __drm_fb_helper_initial_config_and_unlock+0xdb7/0x17b0 drivers/gpu/drm/drm_fb_helper.c:1851 drm_fb_helper_initial_config drivers/gpu/drm/drm_fb_helper.c:1916 [inline] drm_fb_helper_initial_config+0x44/0x60 drivers/gpu/drm/drm_fb_helper.c:1908 drm_fbdev_client_hotplug+0x1a6/0x280 drivers/gpu/drm/clients/drm_fbdev_client.c:52 drm_client_register+0x197/0x280 drivers/gpu/drm/drm_client.c:140 drm_fbdev_client_setup+0x1bd/0x480 drivers/gpu/drm/clients/drm_fbdev_client.c:159 drm_client_setup drivers/gpu/drm/clients/drm_client_setup.c:39 [inline] drm_client_setup+0xb5/0x130 drivers/gpu/drm/clients/drm_client_setup.c:32 vkms_create drivers/gpu/drm/vkms/vkms_drv.c:201 [inline] vkms_init+0x5f5/0x730 drivers/gpu/drm/vkms/vkms_drv.c:221 do_one_initcall+0x123/0x6e0 init/main.c:1257 do_initcall_level init/main.c:1319 [inline] do_initcalls init/main.c:1335 [inline] do_basic_setup init/main.c:1354 [inline] kernel_init_freeable+0x5c2/0x900 init/main.c:1567 kernel_init+0x1c/0x2b0 init/main.c:1457 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #3 (&client->modeset_mutex){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 drm_client_modeset_probe+0x405/0x2f60 drivers/gpu/drm/drm_client_modeset.c:863 __drm_fb_helper_initial_config_and_unlock+0x12d/0x17b0 drivers/gpu/drm/drm_fb_helper.c:1828 drm_fb_helper_initial_config drivers/gpu/drm/drm_fb_helper.c:1916 [inline] drm_fb_helper_initial_config+0x44/0x60 drivers/gpu/drm/drm_fb_helper.c:1908 drm_fbdev_client_hotplug+0x1a6/0x280 drivers/gpu/drm/clients/drm_fbdev_client.c:52 drm_client_register+0x197/0x280 drivers/gpu/drm/drm_client.c:140 drm_fbdev_client_setup+0x1bd/0x480 drivers/gpu/drm/clients/drm_fbdev_client.c:159 drm_client_setup drivers/gpu/drm/clients/drm_client_setup.c:39 [inline] drm_client_setup+0xb5/0x130 drivers/gpu/drm/clients/drm_client_setup.c:32 vkms_create drivers/gpu/drm/vkms/vkms_drv.c:201 [inline] vkms_init+0x5f5/0x730 drivers/gpu/drm/vkms/vkms_drv.c:221 do_one_initcall+0x123/0x6e0 init/main.c:1257 do_initcall_level init/main.c:1319 [inline] do_initcalls init/main.c:1335 [inline] do_basic_setup init/main.c:1354 [inline] kernel_init_freeable+0x5c2/0x900 init/main.c:1567 kernel_init+0x1c/0x2b0 init/main.c:1457 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #2 (&helper->lock){+.+.}-{4:4}: __mutex_lock_common kernel/locking/mutex.c:601 [inline] __mutex_lock+0x199/0xb90 kernel/locking/mutex.c:746 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:228 [inline] __drm_fb_helper_restore_fbdev_mode_unlocked+0xb6/0x200 drivers/gpu/drm/drm_fb_helper.c:216 drm_fb_helper_set_par+0xd8/0x120 drivers/gpu/drm/drm_fb_helper.c:1359 fbcon_init+0x8ab/0x1900 drivers/video/fbdev/core/fbcon.c:1112 visual_init+0x320/0x620 drivers/tty/vt/vt.c:1011 do_bind_con_driver.isra.0+0x57a/0xbf0 drivers/tty/vt/vt.c:3831 do_take_over_console+0x4f4/0x650 drivers/tty/vt/vt.c:4397 do_fbcon_takeover+0xe8/0x210 drivers/video/fbdev/core/fbcon.c:548 do_fb_registered drivers/video/fbdev/core/fbcon.c:2989 [inline] fbcon_fb_registered+0x375/0x6a0 drivers/video/fbdev/core/fbcon.c:3009 do_register_framebuffer+0x46d/0x800 drivers/video/fbdev/core/fbmem.c:449 register_framebuffer+0x23/0x40 drivers/video/fbdev/core/fbmem.c:515 __drm_fb_helper_initial_config_and_unlock+0xdb7/0x17b0 drivers/gpu/drm/drm_fb_helper.c:1851 drm_fb_helper_initial_config drivers/gpu/drm/drm_fb_helper.c:1916 [inline] drm_fb_helper_initial_config+0x44/0x60 drivers/gpu/drm/drm_fb_helper.c:1908 drm_fbdev_client_hotplug+0x1a6/0x280 drivers/gpu/drm/clients/drm_fbdev_client.c:52 drm_client_register+0x197/0x280 drivers/gpu/drm/drm_client.c:140 drm_fbdev_client_setup+0x1bd/0x480 drivers/gpu/drm/clients/drm_fbdev_client.c:159 drm_client_setup drivers/gpu/drm/clients/drm_client_setup.c:39 [inline] drm_client_setup+0xb5/0x130 drivers/gpu/drm/clients/drm_client_setup.c:32 vkms_create drivers/gpu/drm/vkms/vkms_drv.c:201 [inline] vkms_init+0x5f5/0x730 drivers/gpu/drm/vkms/vkms_drv.c:221 do_one_initcall+0x123/0x6e0 init/main.c:1257 do_initcall_level init/main.c:1319 [inline] do_initcalls init/main.c:1335 [inline] do_basic_setup init/main.c:1354 [inline] kernel_init_freeable+0x5c2/0x900 init/main.c:1567 kernel_init+0x1c/0x2b0 init/main.c:1457 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 -> #1 (console_lock){+.+.}-{0:0}: console_lock+0x7a/0xa0 kernel/printk/printk.c:2849 bch2_print_string_as_lines+0x23a/0x300 fs/bcachefs/util.c:277 __bch2_print_str fs/bcachefs/super.c:117 [inline] bch2_print_str+0x98/0xe0 fs/bcachefs/super.c:122 bch2_run_print_explicit_recovery_pass+0x136/0x190 fs/bcachefs/recovery_passes.c:400 check_subvol+0x87d/0x1f70 fs/bcachefs/subvolume.c:65 bch2_check_subvols+0x34a/0x630 fs/bcachefs/subvolume.c:181 bch2_run_recovery_pass fs/bcachefs/recovery_passes.c:415 [inline] __bch2_run_recovery_passes+0x2d6/0x1170 fs/bcachefs/recovery_passes.c:470 bch2_run_recovery_passes+0x2d1/0x480 fs/bcachefs/recovery_passes.c:541 bch2_fs_recovery+0x2a6e/0x4370 fs/bcachefs/recovery.c:974 bch2_fs_start+0xd4c/0x1500 fs/bcachefs/super.c:1206 bch2_fs_get_tree+0xe22/0x1e90 fs/bcachefs/fs.c:2479 vfs_get_tree+0x8e/0x340 fs/super.c:1809 do_new_mount fs/namespace.c:3882 [inline] path_mount+0x14d4/0x1f70 fs/namespace.c:4209 do_mount fs/namespace.c:4222 [inline] __do_sys_mount fs/namespace.c:4433 [inline] __se_sys_mount fs/namespace.c:4410 [inline] __x64_sys_mount+0x28d/0x310 fs/namespace.c:4410 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x4c0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (bcachefs_btree){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 trans_set_locked fs/bcachefs/btree_locking.h:206 [inline] trans_set_locked fs/bcachefs/btree_locking.h:203 [inline] bch2_trans_begin+0x1063/0x1670 fs/bcachefs/btree_iter.c:3338 bchfs_read+0xce4/0x27e0 fs/bcachefs/fs-io-buffered.c:258 bch2_readahead+0x9f5/0x1190 fs/bcachefs/fs-io-buffered.c:316 read_pages+0x1c4/0xc70 mm/readahead.c:160 page_cache_ra_order+0x69a/0xd00 mm/readahead.c:515 do_sync_mmap_readahead mm/filemap.c:3262 [inline] filemap_fault+0x147c/0x2730 mm/filemap.c:3403 bch2_page_fault+0x203/0x880 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0x10d/0x490 mm/memory.c:5098 do_read_fault mm/memory.c:5518 [inline] do_fault mm/memory.c:5652 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x39fb/0x5450 mm/memory.c:6140 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 other info that might help us debug this: Chain exists of: bcachefs_btree --> &mm->mmap_lock --> mapping.invalidate_lock#5 Possible unsafe locking scenario: CPU0 CPU1 ---- ---- rlock(mapping.invalidate_lock#5); lock(&mm->mmap_lock); lock(mapping.invalidate_lock#5); lock(bcachefs_btree); *** DEADLOCK *** 1 lock held by syz.1.4585/23691: #0: ffff8880455528e0 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:932 [inline] #0: ffff8880455528e0 (mapping.invalidate_lock#5){.+.+}-{4:4}, at: page_cache_ra_order+0x322/0xd00 mm/readahead.c:491 stack backtrace: CPU: 1 UID: 0 PID: 23691 Comm: syz.1.4585 Not tainted 6.15.0-syzkaller-07774-g90b83efa6701 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_circular_bug+0x275/0x350 kernel/locking/lockdep.c:2046 check_noncircular+0x14c/0x170 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x126f/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 trans_set_locked fs/bcachefs/btree_locking.h:206 [inline] trans_set_locked fs/bcachefs/btree_locking.h:203 [inline] bch2_trans_begin+0x1063/0x1670 fs/bcachefs/btree_iter.c:3338 bchfs_read+0xce4/0x27e0 fs/bcachefs/fs-io-buffered.c:258 bch2_readahead+0x9f5/0x1190 fs/bcachefs/fs-io-buffered.c:316 read_pages+0x1c4/0xc70 mm/readahead.c:160 page_cache_ra_order+0x69a/0xd00 mm/readahead.c:515 do_sync_mmap_readahead mm/filemap.c:3262 [inline] filemap_fault+0x147c/0x2730 mm/filemap.c:3403 bch2_page_fault+0x203/0x880 fs/bcachefs/fs-io-pagecache.c:594 __do_fault+0x10d/0x490 mm/memory.c:5098 do_read_fault mm/memory.c:5518 [inline] do_fault mm/memory.c:5652 [inline] do_pte_missing mm/memory.c:4160 [inline] handle_pte_fault mm/memory.c:5997 [inline] __handle_mm_fault+0x39fb/0x5450 mm/memory.c:6140 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1336 handle_page_fault arch/x86/mm/fault.c:1476 [inline] exc_page_fault+0x5c/0xb0 arch/x86/mm/fault.c:1532 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7f941ae54f30 Code: 18 48 0f ca 48 89 54 24 18 48 83 f8 01 0f 85 7a 02 00 00 48 8b 44 24 10 48 8b 54 24 18 48 89 10 e9 d2 fd ff ff 48 8b 44 24 10 <0f> b7 10 48 8b 44 24 08 48 85 c0 0f 84 36 01 00 00 48 83 f8 01 0f RSP: 002b:00007ffe71563510 EFLAGS: 00010202 RAX: 0000200000000316 RBX: 000000000e000002 RCX: 0000000000000000 RDX: ff4120ea22b95023 RSI: 0000000000000000 RDI: 00005555812053c8 RBP: 00007ffe71563618 R08: 0000000000000000 R09: 000000000000000e R10: 0000000000000000 R11: 0000000000000000 R12: 00007f941b1b5fac R13: 00007f941b1b5fa0 R14: fffffffffffffffe R15: 00007ffe71563660 </TASK> bcachefs (loop1): /file1 offset 0: read error -2329 from btree lookup bcachefs (loop1): btree_path_down(): fatal error node not found at pos 536870912:1:U32_MAX within parent node u64s 5 type btree_ptr SPOS_MAX len 0 ver 0 bcachefs (loop1): /file1 offset 0: read error -2329 from btree lookup
Time | Kernel | Commit | Syzkaller | Config | Log | Report | Syz repro | C repro | VM info | Assets (help?) | Manager | Title |
---|---|---|---|---|---|---|---|---|---|---|---|---|
2025/05/29 13:09 | upstream | 90b83efa6701 | 3d2f584d | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-badwrites-root | possible deadlock in bch2_trans_begin | ||
2025/05/25 01:58 | upstream | b1427432d3b6 | ed351ea7 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-fs | possible deadlock in bch2_trans_begin | ||
2025/05/24 23:29 | upstream | b1427432d3b6 | ed351ea7 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci2-upstream-fs | possible deadlock in bch2_trans_begin | ||
2025/04/19 18:58 | upstream | 8560697b23dc | 2a20f901 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-root | possible deadlock in bch2_trans_begin | ||
2025/01/16 02:22 | upstream | 619f0b6fad52 | 968edaf4 | .config | console log | report | info | [disk image] [vmlinux] [kernel image] | ci-upstream-kasan-gce-root | possible deadlock in bch2_trans_begin |