[pull] master from torvalds:master#531
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pull[bot] merged 3 commits intoCache-Cloud:masterfrom Nov 25, 2019
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When both CONFIG_CRAMFS_MTD and CONFIG_CRAMFS_BLOCKDEV are enabled, if we fail to mount on MTD, we don't try on block device. Note: this relies upon cramfs_mtd_fill_super() leaving no side effects on fc state in case of failure; in general, failing get_tree_...() does *not* mean "fine to try again"; e.g. parsed options might've been consumed by fill_super callback and freed on failure. Fixes: 74f78fc ("vfs: Convert cramfs to use the new mount API") Signed-off-by: Maxime Bizon <mbizon@freebox.fr> Signed-off-by: Nicolas Pitre <nico@fluxnic.net> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
…/viro/vfs Pull cramfs fix from Al Viro: "Regression fix, fallen through the cracks" * 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: cramfs: fix usage on non-MTD device
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There is a fancy bug, where exiting user task may not have ->mm, that makes task_works to try to do kthread_use_mm(ctx->sqo_mm). Don't do that if sqo_mm is NULL. [ 290.460558] WARNING: CPU: 6 PID: 150933 at kernel/kthread.c:1238 kthread_use_mm+0xf3/0x110 [ 290.460579] CPU: 6 PID: 150933 Comm: read-write2 Tainted: G I E 5.8.0-rc2-00066-g9b21720607cf #531 [ 290.460580] RIP: 0010:kthread_use_mm+0xf3/0x110 ... [ 290.460584] Call Trace: [ 290.460584] __io_sq_thread_acquire_mm.isra.0.part.0+0x25/0x30 [ 290.460584] __io_req_task_submit+0x64/0x80 [ 290.460584] io_req_task_submit+0x15/0x20 [ 290.460585] task_work_run+0x67/0xa0 [ 290.460585] do_exit+0x35d/0xb70 [ 290.460585] do_group_exit+0x43/0xa0 [ 290.460585] get_signal+0x140/0x900 [ 290.460586] do_signal+0x37/0x780 [ 290.460586] __prepare_exit_to_usermode+0x126/0x1c0 [ 290.460586] __syscall_return_slowpath+0x3b/0x1c0 [ 290.460587] do_syscall_64+0x5f/0xa0 [ 290.460587] entry_SYSCALL_64_after_hwframe+0x44/0xa9 following with faults. Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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