Hello, I tried categorizing under documentation, but there's only man-pages as the component and my bug was closed as invalid. I've updated the bugzilla link. The file: Documentation/admin-guide/bug-hunting.rst gives instructions on how to find the offending line of code using EIP. My particular bug that I need to report doesn't have EIP listed -- at least not by name. I tried to guess what EIP was in my case "__schedule+0x29e/0x6c0" but that didn't produce any results in gdb on my debug kernel. I don't appear to have the referenced module type problem: "[<ffffffff8802c8e9>] :jbd:log_wait_commit+0xa3/0xf5" I'm totally new to kernel debugging so the documentation is really important and I'm rather frustrated in even bothering to read it as it's incomplete/unhelpful. Here's the exact bug I'm trying to tackle. [68812.480447] INFO: task CacheThread_Blo:9414 blocked for more than 480 seconds. [68812.480459] Not tainted 4.14.184-nopreempt-AMDGPU-dav9 #1 [68812.480464] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [68812.480469] CacheThread_Blo D 0 9414 9082 0x00000080 [68812.480476] Call Trace: [68812.480494] __schedule+0x29e/0x6c0 [68812.480505] schedule+0x32/0x80 [68812.480513] schedule_preempt_disabled+0xa/0x10 [68812.480520] __mutex_lock.isra.1+0x26b/0x4e0 [68812.480550] ? do_journal_begin_r+0xbe/0x390 [reiserfs] [68812.480570] do_journal_begin_r+0xbe/0x390 [reiserfs] [68812.480586] ? __switch_to_asm+0x35/0x70 [68812.480588] ? __switch_to_asm+0x41/0x70 [68812.480590] ? __switch_to_asm+0x35/0x70 [68812.480592] ? __switch_to_asm+0x41/0x70 [68812.480593] ? __switch_to_asm+0x35/0x70 [68812.480595] ? __switch_to_asm+0x41/0x70 [68812.480597] ? __switch_to_asm+0x35/0x70 [68812.480601] journal_begin+0x80/0x140 [reiserfs] [68812.480606] reiserfs_dirty_inode+0x3d/0xa0 [reiserfs] [68812.480609] ? __switch_to+0x1ee/0x3f0 [68812.480610] ? __switch_to+0x1ee/0x3f0 [68812.480612] __mark_inode_dirty+0x163/0x350 [68812.480615] generic_update_time+0x79/0xc0 [68812.480617] ? current_time+0x38/0x70 [68812.480619] file_update_time+0xbe/0x110 [68812.480622] __generic_file_write_iter+0x99/0x1b0 [68812.480624] generic_file_write_iter+0xe2/0x1c0 [68812.480626] __vfs_write+0x102/0x180 [68812.480628] vfs_write+0xb0/0x190 [68812.480630] SyS_pwrite64+0x90/0xb0 [68812.480632] do_syscall_64+0x6e/0x110 [68812.480634] entry_SYSCALL_64_after_hwframe+0x41/0xa6 [68812.480637] RIP: 0033:0x7f8a92976983 [68812.480638] RSP: 002b:00007f8a779e1630 EFLAGS: 00000293 ORIG_RAX: 0000000000000012 [68812.480640] RAX: ffffffffffffffda RBX: 00007f8a779e1640 RCX: 00007f8a92976983 [68812.480641] RDX: 0000000000000128 RSI: 000001790ddf3c00 RDI: 0000000000000040 [68812.480642] RBP: 00007f8a779e16f0 R08: 00007f8a779e1558 R09: 0000000000000001 [68812.480643] R10: 0000000000002000 R11: 0000000000000293 R12: 0000000000002000 [68812.480644] R13: 000001790a6b8dd0 R14: 000001790ddf3c00 R15: 0000000000000128 [68812.480647] INFO: task ThreadPoolSingl:9908 blocked for more than 480 seconds. 4.14.184 https://bugzilla.kernel.org/show_bug.cgi?id=208777 Thanks, David
