https://bugzilla.kernel.org/show_bug.cgi?id=204243 Bug ID: 204243 Summary: WARNING: possible circular locking dependency detected [sr_mod] Product: IO/Storage Version: 2.5 Kernel Version: 5.2.1 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: SCSI Assignee: linux-scsi@xxxxxxxxxxxxxxx Reporter: erhard_f@xxxxxxxxxxx Regression: No Created attachment 283867 --> https://bugzilla.kernel.org/attachment.cgi?id=283867&action=edit dmesg output Encountered this during writing an .iso to a DVD-RW media: [...] [ 6908.678745] ====================================================== [ 6908.678746] WARNING: possible circular locking dependency detected [ 6908.678749] 5.2.1-gentoo #1 Not tainted [ 6908.678750] ------------------------------------------------------ [ 6908.678752] brasero/1066 is trying to acquire lock: [ 6908.678754] 0000000087aec994 (&mm->mmap_sem#2){++++}, at: __do_page_fault+0x387/0x420 [ 6908.678761] but task is already holding lock: [ 6908.678762] 0000000056293ac4 (sr_mutex){+.+.}, at: sr_block_ioctl+0x3a/0xc0 [sr_mod] [ 6908.678768] which lock already depends on the new lock. [ 6908.678769] the existing dependency chain (in reverse order) is: [ 6908.678770] -> #6 (sr_mutex){+.+.}: [ 6908.678773] -> #5 (&bdev->bd_mutex){+.+.}: [ 6908.678775] -> #4 (&fs_devs->device_list_mutex){+.+.}: [ 6908.678777] -> #3 (&fs_info->tree_log_mutex){+.+.}: [ 6908.678780] -> #2 (&fs_info->reloc_mutex){+.+.}: [ 6908.678782] -> #1 (sb_pagefaults){.+.+}: [ 6908.678784] -> #0 (&mm->mmap_sem#2){++++}: [ 6908.678786] other info that might help us debug this: [ 6908.678787] Chain exists of: &mm->mmap_sem#2 --> &bdev->bd_mutex --> sr_mutex [ 6908.678790] Possible unsafe locking scenario: [ 6908.678791] CPU0 CPU1 [ 6908.678793] ---- ---- [ 6908.678794] lock(sr_mutex); [ 6908.678795] lock(&bdev->bd_mutex); [ 6908.678797] lock(sr_mutex); [ 6908.678798] lock(&mm->mmap_sem#2); [ 6908.678800] *** DEADLOCK *** [ 6908.678801] 1 lock held by brasero/1066: [ 6908.678802] #0: 0000000056293ac4 (sr_mutex){+.+.}, at: sr_block_ioctl+0x3a/0xc0 [sr_mod] [ 6908.678806] stack backtrace: [ 6908.678809] CPU: 1 PID: 1066 Comm: brasero Not tainted 5.2.1-gentoo #1 [ 6908.678810] Hardware name: System manufacturer System Product Name/M5A78L-M LX3, BIOS 1401 05/05/2016 [ 6908.678812] Call Trace: [ 6908.678816] dump_stack+0x67/0x98 [ 6908.678820] print_circular_bug.cold.60+0x15c/0x195 [ 6908.678823] __lock_acquire+0x17c0/0x1d18 [ 6908.678826] lock_acquire+0xaa/0x168 [ 6908.678828] ? __do_page_fault+0x387/0x420 [ 6908.678831] ? copy_user_generic_string+0x29/0x40 [ 6908.678833] down_read+0x28/0xc0 [ 6908.678836] ? __do_page_fault+0x387/0x420 [ 6908.678838] __do_page_fault+0x387/0x420 [ 6908.678841] ? page_fault+0x1b/0x20 [ 6908.678843] ? copy_user_generic_string+0x29/0x40 [ 6908.678846] ? copyout+0x25/0x30 [ 6908.678847] ? copy_page_to_iter+0xd0/0x330 [ 6908.678850] ? bio_uncopy_user+0x124/0x168 [ 6908.678852] ? blk_rq_unmap_user+0x22/0x60 [ 6908.678855] ? sg_io+0x268/0x440 [ 6908.678857] ? scsi_cmd_ioctl+0x2b2/0x498 [ 6908.678861] ? cdrom_ioctl+0x36/0xde4 [cdrom] [ 6908.678864] ? _raw_spin_unlock_irqrestore+0x37/0x40 [ 6908.678866] ? __pm_runtime_resume+0x4f/0x70 [ 6908.678869] ? sr_block_ioctl+0x9d/0xc0 [sr_mod] [ 6908.678872] ? blkdev_ioctl+0x52e/0xa80 [ 6908.678874] ? find_held_lock+0x2d/0x90 [ 6908.678876] ? block_ioctl+0x2d/0x38 [ 6908.678879] ? do_vfs_ioctl+0xa8/0x718 [ 6908.678881] ? __fget+0x101/0x1e0 [ 6908.678883] ? ksys_ioctl+0x35/0x70 [ 6908.678884] ? __x64_sys_ioctl+0x11/0x18 [ 6908.678887] ? do_syscall_64+0x4b/0x198 [ 6908.678889] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe [ 6984.804171] capability: warning: `growisofs' uses 32-bit capabilities (legacy support in use) -- You are receiving this mail because: You are the assignee for the bug.
